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[ARCHIVED THREAD] - Thoughts on the CMMG Guard? (Page 12 of 25)
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Has anyone used the CMMG barrel/bolt combo with a New Frontier receiver set? I’m wondering would the receiver ejector be a problem. New Frontier receiver with CMMG Guard setup "On the NFA lower, over insertion is stopped by the ejector, it acts as a stop for the mag. You have to remove the ejector from the lower to run the guard bolt because it is not slotted. I have been machining stops that drop in place of the ejector of the NFA lower. My NFA lower works great the the guard upper with the stop installed." |
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I think the real question is in regards to the upper, not the lower. I've asked NFA specifically about it, but have yet to get a response. I also asked another member in another thread, but got a confusing answer. More specifically about side-chargers. The question is if the pistol-caliber specific upper has the correct cam-slot to work with the guard's more standard BCG. Then the question becomes, if that does work, can the same be said for the side-charger pistol caliber upper using a modified cam-pin from the 556 style side-charger. I have a pin coming so I'll find out this weekend. |
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Just received my first 9mm upper the CMMG Banshee (Guard). It fits my Spike's sbr lower perfectly. The bcg trips the rdias. I didn't have to remove any material from the rear lug for it to slip on there like I did with my Spike's uppers. The Banshee is TINY with its' short barrel/hand guard. So far the only thing I would change is the over-sized ambi charging handle. Wings are too big and sharp cornered imo. I don't have a mag block yet and will never have one if the Endomag is as good as it looks. Can't wait to try it. Attached File |
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Fyi I noticed something different about the bcg on the CMMG rdb system: A spring keeps the bolt extended so the bcg sticks out a bit in the back, it does not click into place and stay flush. The rdb bcg has to be held in to get it flush with the buffer tube before you can close the upper/lower.
Not a problem but had me puzzled for a bit. |
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A Banshee/Guard pic or 2 to whet your appetite. MP5'ish lines with the folding grip. Surprisingly well made considering it was only 13 bucks.
Attached File Attached File Attached File |
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I've been following this thread for some time and keeping track of the progress for a future build of my own. It appears that the A5 system with either a regular rifle spring or the Tubb's flat wire seem to be preferred. I've also noticed that the buffer/carrier weight total seems to favor the H0 or H1 A5 buffers along with a 3.5 ounce carrier weight. I only plan on a semi auto, but really like the idea of a softer shooting system.
Have you fellows looked at Rudy's (Macon Armory) 9mm dedicated dead blow buffer? It's filled with lead shot and adjustable for weights from 7.5 ounces down to 5.5 ounces by removing shot. I measured one of mine and the length I have for the 9mm dead blow buffer is 4.04 inches (someone previously measured an A5 buffer at 3.97 inches). My scale showed the buffer I checked has starting weight at 7.6 ounces. |
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I've been following this thread for some time and keeping track of the progress for a future build of my own. It appears that the A5 system with either a regular rifle spring or the Tubb's flat wire seem to be preferred. I've also noticed that the buffer/carrier weight total seems to favor the H0 or H1 A5 buffers along with a 3.5 ounce carrier weight. I only plan on a semi auto, but really like the idea of a softer shooting system. Have you fellows looked at Rudy's (Macon Armory) 9mm dedicated dead blow buffer? It's filled with lead shot and adjustable for weights from 7.5 ounces down to 5.5 ounces by removing shot. I measured one of mine and the length I have for the 9mm dead blow buffer is 4.04 inches (someone previously measured an A5 buffer at 3.97 inches). My scale showed the buffer I checked has starting weight at 7.6 ounces. |
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Still new to all this but why would you need that heavy a buffer for the Guard upper? They use a carbine buffer and .308 spring with their lower. Quoted:
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I've been following this thread for some time and keeping track of the progress for a future build of my own. It appears that the A5 system with either a regular rifle spring or the Tubb's flat wire seem to be preferred. I've also noticed that the buffer/carrier weight total seems to favor the H0 or H1 A5 buffers along with a 3.5 ounce carrier weight. I only plan on a semi auto, but really like the idea of a softer shooting system. Have you fellows looked at Rudy's (Macon Armory) 9mm dedicated dead blow buffer? It's filled with lead shot and adjustable for weights from 7.5 ounces down to 5.5 ounces by removing shot. I measured one of mine and the length I have for the 9mm dead blow buffer is 4.04 inches (someone previously measured an A5 buffer at 3.97 inches). My scale showed the buffer I checked has starting weight at 7.6 ounces. I already tested from 2.9 through 7.4. 7.4 wouldn't lock the bolt back and was bouncy and wouldn't lock the bolt back. Also note that in my testing an H3 buffer (5.3oz) was unreliable and giving me malfunctions. Although the 9mm Hydraulic is 5.9 oz, it didn't give me problems which I'm suspecting has to do with the hydraulic dampening. |
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I'm guessing he is saying it is configurable from 7.5 to 5.5. I already tested from 2.9 through 7.4. 7.4 wouldn't lock the bolt back and was bouncy and wouldn't lock the bolt back. Also note that in my testing an H3 buffer (5.3oz) was unreliable and giving me malfunctions. Although the 9mm Hydraulic is 5.9 oz, it didn't give me problems which I'm suspecting has to do with the hydraulic dampening. Quoted:
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I've been following this thread for some time and keeping track of the progress for a future build of my own. It appears that the A5 system with either a regular rifle spring or the Tubb's flat wire seem to be preferred. I've also noticed that the buffer/carrier weight total seems to favor the H0 or H1 A5 buffers along with a 3.5 ounce carrier weight. I only plan on a semi auto, but really like the idea of a softer shooting system. Have you fellows looked at Rudy's (Macon Armory) 9mm dedicated dead blow buffer? It's filled with lead shot and adjustable for weights from 7.5 ounces down to 5.5 ounces by removing shot. I measured one of mine and the length I have for the 9mm dead blow buffer is 4.04 inches (someone previously measured an A5 buffer at 3.97 inches). My scale showed the buffer I checked has starting weight at 7.6 ounces. I already tested from 2.9 through 7.4. 7.4 wouldn't lock the bolt back and was bouncy and wouldn't lock the bolt back. Also note that in my testing an H3 buffer (5.3oz) was unreliable and giving me malfunctions. Although the 9mm Hydraulic is 5.9 oz, it didn't give me problems which I'm suspecting has to do with the hydraulic dampening. The reason I brought this buffer up is because I am wanting to duplicate the softer recoil impulse mentioned by amphibian and by Doctor_Evil in their testing. The only reason I see for switching from a blow back bolt assembly to CMMG's RDB bolt carrier group is for the softer/smoother impulse. If it wasn't for that feature, I would just stay with what I already have (you can almost purchase a complete AR9 pistol from PSA for the price of the barrel/bolt combo and the MkG upper receiver from CMMG). And using a heavy spring along with a light weight buffer seems like it would just be harder on the components. At least it is on blow backguns. I'm looking to build a dedicated 9mm Guard pistol and want to use as few variables as possible to obtain a similar recoil to theirs. In other words, no added carrier weight and any fine tuning done with the buffer and spring only as I have been doing on pistol caliber blow back systems. Hopefully my explanation isn't just rambling and makes some sense. Edited for corrections. |
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I'm guessing he is saying it is configurable from 7.5 to 5.5. I already tested from 2.9 through 7.4. 7.4 wouldn't lock the bolt back and was bouncy and wouldn't lock the bolt back. Also note that in my testing an H3 buffer (5.3oz) was unreliable and giving me malfunctions. Although the 9mm Hydraulic is 5.9 oz, it didn't give me problems which I'm suspecting has to do with the hydraulic dampening. Any suggestions on where to start? As is (UC2/flat spring/no carrier weight) for step number one? Add 1 oz. carrier weight for step 2, then 2 oz., etc? Then switch buffers and springs and repeat? Gotta be a good combination in there somewhere. |
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Never really fading as far as I know, some fudds call a 5.56 a pea shooter too. P90's really shine in full auto, but the amount of rounds you can get on target in a hurry make it viable even if people post 22mag gel tests in comparison. Quoted:
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The 5.7 Banshee is a blast! P90's really shine in full auto, but the amount of rounds you can get on target in a hurry make it viable even if people post 22mag gel tests in comparison. especially since something like Fed AmEagle can be had for less than $.40/rd... |
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Any suggestions on where to start? As is (UC2/flat spring/no carrier weight) for step number one? Add 1 oz. carrier weight for step 2, then 2 oz., etc? Then switch buffers and springs and repeat? Gotta be a good combination in there somewhere. |
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Your on your own there....I played around with those compact stocks and buffer systems and they will just never be as smooth and with low RoF as going with longer tubes. |
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Did you get a chance to try the Tuning Kit in combination with buffers/springs? I may have to reinstall the original tube, buffer, and spring in the end but no big whoop there. I'm leaving things alone till I get the Endomags in for testing. |
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Yes. Already tried the tuning kit. Im running the heaviest weight, A5 tube, 556 Tubb flat spring and 9mm Blitzkrieg/Kynshot buffer. This configuration is working 100% for me with Glock mags. As mentioned before, the Colt mags require more force to strip rounds off. I have to remove the carrier weight to run with Colt mags with this buffer system. I'm leaving things alone till I get the Endomags in for testing. Btw a friend on another forum suggested a i-phone/android app that will measure rof. Do you use that to determine your rof? Rate of Fire App |
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Quoted: Kynshot is 4.3 oz. right? How can CMMG use a standard carbine buffer (3 oz.?) and .308 spring in their lower and be gtg? You are adding 1+ oz. more buffer and 3+ oz. of carrier weight to hit your sweet spot. I am puzzled about that. Btw a friend on another forum suggested a i-phone/android app that will measure rof. Do you use that to determine your rof? Rate of Fire App As documented, note that a 5.3 oz H3 buffer was unreliable with this setup. It's not just about weight. Remember, I'm using a hydraulic buffer here. I also tested with an old 7.4oz AAC buffer and custom tungsten 5.1 oz carrier weight. Wouldn't lock bolt back and too much mass making it feel too bouncy. CMMG isn't running a Tubb flat spring nor an A5 tube. If I use a different spring that buffer won't work. Shorter tube would also mean more preload the BCG would have to overcome. Again CMMG's recommendations are fine but just too fast for me in full auto. I use a PACT MkIV timer that has ROF built in. Picture below taken from my link above. 
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No. 5.9 oz.. Again all documented here. http://c3junkie.com/?page_id=538 As documented, note that a 5.3 oz H3 buffer was unreliable with this setup. It's not just about weight. Remember, I'm using a hydraulic buffer here. I also tested with an old 7.4oz AAC buffer and custom tungsten 5.1 oz carrier weight. Wouldn't lock bolt back and too much mass making it feel too bouncy. CMMG isn't running a Tubb flat spring nor an A5 tube. If I use a different spring that buffer won't work. Shorter tube would also mean more preload the BCG would have to overcome. Again CMMG's recommendations are fine but just too fast for me in full auto. I use a PACT MkIV timer that has ROF built in. Picture below taken from my link above. http://c3junkie.com/wp-content/uploads/2018/05/KynshotBlitzkrieg-A5-Tubbs.png  Failed To Load Title While we are on the subject I learned that some use a longer buffer with half the pad cut off or a spacer to shorten travel to prevent breaking the bolt stop and to alleviate bounce. I have a good .25+ inch of travel past the bolt stop with my setup as is and it looks like a bit too much. Considering the forces involved even with the RDB system I may want to shorten travel a bit. Thoughts? |
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Different model than yours? While we are on the subject I learned that some use a longer buffer with half the pad cut off or a spacer to shorten travel to prevent breaking the bolt stop and to alleviate bounce. I have a good .25+ inch of travel past the bolt stop with my setup as is and it looks like a bit too much. Considering the forces involved even with the RDB system I may want to shorten travel a bit. Thoughts? Other details are all covered there. I don't want to re-type everything here and most people here probably don't care about full auto which is why I just put a link for those that want those details. Again, please look over these two links and hopefully you will get the answers you need: http://c3junkie.com/?page_id=538 http://c3junkie.com/?page_id=571 Regarding bolt travel past the bolt stop, I think you are confusing some of the recommendations for straight blowback recoil/buffer systems and the Guard system. Since the Guard is using the same 'geometry' of a standard 556 setup you should have your buffer/tube/spring setup with the same travel as 556. Issues with breaking the bolt stop should not be relevant with the Guard system. |
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Sorry, I don't mean to be rude but have you even read the links I keep posting? I cover what I use to determine the RoF, pictures of the buffer I'm using (which has the part number) and the weight of the buffer in that link. Other details are all covered there. I don't want to re-type everything here and most people here probably don't care about full auto which is why I just put a link for those that want those details. Again, please look over these two links and hopefully you will get the answers you need: http://c3junkie.com/?page_id=538 http://c3junkie.com/?page_id=571 Regarding bolt travel past the bolt stop, I think you are confusing some of the recommendations for straight blowback recoil/buffer systems and the Guard system. Since the Guard is using the same 'geometry' of a standard 556 setup you should have your buffer/tube/spring setup with the same travel as 556. Issues with breaking the bolt stop should not be relevant with the Guard system. Good to know the Guard will not have bolt stop problems. It's questions like that I need answers to and I have to ask or I won't get an answer. Thanks. |
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I had been using the Kynshot rifle buffer and the 1oz weight (smallest one) and I was getting well below 600 RPM, was so nice to basically shoot it almost like it was in the semi-position. But because I was getting a malfunction every 4 or 5 mags, I knew it wasn't good enough for competition. Especially since those malfunctions are UGLY...the case gets jammed into the bold sideways and it has to be pried out....no standard malfunction clearing procedure works for that! So I dropped the weight when I went to the 9mm. ROF def went up...can get singles when trying harder..but competition was def a mixture of lots of singles and doubles. But I had absolutely 0 malfunctions and LRBHO worked every single time. I'm hoping the wight will help. Maybe we can add the weight (1oz)..which by the way still allows you to use a LAW folding stock adapter! and trim a coil or two off the regular power spring? It is also worth mentioning that (maybe I did before) that was 100% reliable with hot ammo. When I ran some really weak gammer ammo....it ran super soft and smooth, but I did get a few malfunctions. I was running the heaviest carrier weight, A5 buffer tube, 9mm Blitzkrieg/Kynshot buffer, 556 Tubb spring. My Reloads 147Gr Precision Delta with 3.7Gr Titegroup. I had 6 or 7 malfunctions during the match which I think are due to me running my setup with the heaviest carrier weight. I think I will have to drop the weight entirely like you did. Below is a link to the first bay we ran. I was heavy on trigger for this stage....all the reason I need to slow it down. Burned way more rounds than needed to neutralize the targets...but it was fun. No malfunctions on that stage. 
https://www.youtube.com/watch?v=M1xytZoYemk |
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I finally got mine 'mocked up' I tried to use a Matrix Arms side-charger and it was a no-go. Cam pin channel isn't cut for it even using an NFA C4 special cam pin. I used a Spartan/NFA normal upper I had laying around and had to lower the mags via filing the mag catch pretty significantly before the bolt would ride over an empty follower. trimming the 'nose' on the LH side of the follower helped as well. This is an NFA/Spartan lower. I'll be taking it out the first dry day with a myriad of spring/buffer combos. I'm hoping to use a JP SCS I stole from another rig and put the heaviest spring from their alternate spring pack on there (no color). But also have H0, H1, 9mm Kynshot, and taccom 9mm buffers + 223 carbine, rifle, and .308 carbine springs to try. ETA: Ran flawlessly after mag catch work + installing an aftermarket over-insertion stop to keep the now-lowered mags from jamming up if monopodded, etc. The best combo I came up with was (shockingly) my 9mm Hydraulic buffer and .223 rifle length spring. The .308 carbine spring worked, but I had one jam, so I ditched it. It was softer than my blowback 9mm, but not a ton. I then picked up a buddy's sig MPX and shot them back to back... I now own an MPX.. and 2 colt PCC's.. and a franken-guard. 
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I have a complete Colt 9mm AR-15 Lightweight Sporter, model R6430, that I use for PCC. I like the Guard due to its recoil system and that it can take Glock mags, but cannot afford to buy a complete rifle at this time. Has anyone successfully mated a Colt 9mm upper over a CMMG Guard 9mm lower that takes Glock mags? I understand I would need to modify the Colt bolt to accept Glock mags or buy another bolt made for Glock mags. If it doesn't work, then I would still have a nice CMMG Guard 9mm Glock lower that I could make work by later buying a complete Guard upper. Thanks in advance for your comments. |
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I have a complete Colt 9mm AR-15 Lightweight Sporter, model R6430, that I use for PCC. I like the Guard due to its recoil system and that it can take Glock mags, but cannot afford to buy a complete rifle at this time. Has anyone successfully mated a Colt 9mm upper over a CMMG Guard 9mm lower that takes Glock mags? I understand I would need to modify the Colt bolt to accept Glock mags or buy another bolt made for Glock mags. If it doesn't work, then I would still have a nice CMMG Guard 9mm Glock lower that I could make work by later buying a complete Guard upper. Thanks in advance for your comments. I don't know if you've seen this thread: https://www.ar15.com/forums/ar-15/Anyone-seen-this-MEAN-Arms-9mm-adpater-/15-728601/&page=8 But I'm using the Mean arms Endo mag with Guard upper https://www.youtube.com/watch?v=_XaGtM2NT38 I'm hoping Mean arms comes out with a 40 round adapter for 40 round Pmags. |
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I have a complete Colt 9mm AR-15 Lightweight Sporter, model R6430, that I use for PCC. I like the Guard due to its recoil system and that it can take Glock mags, but cannot afford to buy a complete rifle at this time. Has anyone successfully mated a Colt 9mm upper over a CMMG Guard 9mm lower that takes Glock mags? I understand I would need to modify the Colt bolt to accept Glock mags or buy another bolt made for Glock mags. If it doesn't work, then I would still have a nice CMMG Guard 9mm Glock lower that I could make work by later buying a complete Guard upper. Thanks in advance for your comments. |
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I appreciate your reply and the important tip that the Guard's bolt carrier requires mags to seat lower than a regular blowback gun. I did read the tips here about someone converting a Colt lower to work with a Guard upper. It's pretty labor intensive! I have been following the Mean Arms endomag 9mm inserts. In fact, it was cool seeing your video. Glad they are working for you. I certainly considered them. In fact, I would just need to get four of them ($100) and a Colt adapter sleeve to make my Colt 9mm upper large pin work with my Spikes tactical (small pin) 223 lower. It would solve the problem of trying to reload Colt mags, which are extremely difficult. I live in a 10-round state and use the gun for PCC competition, which puts me at a disadvantage due to the slow reloads. I'll look harder into the endomags as they appear to be the cheapest solution in solving the problem of the slow Colt mag reloads. Thanks. |
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I appreciate your reply. I was able to read the detailed, but to-labor-intensive directions on how to fit a Guard upper to a Colt lower. Kudos to those skilled to accomplish this amazing feat. I should have mentioned the goal of making an upgrade is to avoid using Colt mags, which are slow to reload. I live in a 10-round state and use the gun for PCC, which puts me at a disadvantage. I'll probably just pick up a few Mean Arms endomag 9mm inserts and use my Colt 9mm upper over my Spikes 223 lower, and add a hydraulic buffer. Or, is there a list of Glock 9mm lower receivers that are proven to work with CMMG uppers? Thanks. |
| Does anyone have the ejection port dimensions of an actual Guard upper? I have a red anodized 556 upper I'd like to use and want to remove as little material as possible. Was using a 458 upper that worked perfectly, but I'm a glutton for punishment (and shiny things). |
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Does anyone have the ejection port dimensions of an actual Guard upper? I have a red anodized 556 upper I'd like to use and want to remove as little material as possible. Was using a 458 upper that worked perfectly, but I'm a glutton for punishment (and shiny things). |
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A Banshee/Guard pic or 2 to whet your appetite. MP5'ish lines with the folding grip. Surprisingly well made considering it was only 13 bucks. https://www.AR15.Com/media/mediaFiles/374164/IMG_20180915_153603-672843.JPG https://www.AR15.Com/media/mediaFiles/374164/IMG_20180915_190726-672847.JPG https://www.AR15.Com/media/mediaFiles/374164/IMG_20180915_190900-672848.JPG Nevermind, found it Fab Defense |
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Quoted: @HDSledge What folding grip is that? Folding Grip This one has a storage area with cap, 5 positions. $11 There are plenty of these out there with no storage area, stumbled onto this variety. Standard mount. Folding Grip with Storage These are def Chinese knockoffs considering the one you linked to was $54. Come to think of it I may buy one from FabDefense to see how the quality compares. And to support US biz (unless they get theirs from China too.) EDIT: FabDefense one is slightly different and is made in Israel. |
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Posted: 3/25/2018 6:31:22 AM EDT
Quoted: I was having failures to eject. I pulled the ejector spring and it was about an 1/8" shorter than a standard 556 ejector spring. Replaced the ejector spring and that problem went away. So I'm talking about basically two relatively new BCG's. They both were working well for about 500 rounds and now starting having stovepipe's and malfunctions like seen below: 
This is an ugly one where spent case gets caught between carrier and charging handle so you need drop mag and apply rearward pressure on the bolt face to release the fired case.  This is all caused by the ejector springs getting killed rather quickly. As I posted back in March, I'm seeing this again. The two springs on the right were removed from the relatively new BCG's from CMMG and you can see the new tacticalsprings.com ejector spring (which is the same length as just about every other ejector spring I've seen). I swapped the ejector springs on both BCG's and was back in business. I would say each BCG had seen around 500 rounds. It is running in full auto but not heavy bursts though. I'm not doing mag dumps and not getting that hot. I don't see why the ejector springs are dying so fast when they last a lot longer in other setups like full auto 556 setups as well as 7.62x39.... The only other configuration where I see ejector springs die fast for some reason is 5.45x39. I don't know why.... However, come to think of it, I had worked on a prototype 9mm Piston upper and the bolt we used for that configuration was conicidentally a 5.45x39mm bolt since the bolt face has to be the same diameter for 5.45x39 as it does for 9mm. 
If that wasn't enough I had the firing pin break on both carriers yesterday. I don't know if they just got some crappy firing pins, or if this a design flaw or something else going on. I'm using a Geissele SSF trigger group w/ the Geissele supplied springs...nothing extra power either. 
I've sent an email to CMMG to see what they say. I'm really hoping this is just a case of CMMG getting some substandard firing pins and ejector springs and have replaced both in both of my BCG's and will be curious to see when I start having issues again. |
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They both were working well for about 500 rounds and now starting having stovepipe's and malfunctions like seen below: If that wasn't enough I had the firing pin break on both carriers yesterday. I don't know if they just got some crappy firing pins, or if this a design flaw or something else going on. I'm using a Geissele SSF trigger group w/ the Geissele supplied springs...nothing extra power either. I've had several malfunctions just like yours. Since I never started with a functioning Guard as a baseline (which I regret), I always chalked them up to it being a franken-build. Now I'm thinking I need to swap the ejector spring and see if it makes a difference. Both of my Guard combos (45 & 9) were bought right after they were released so safe to say I have first gens. Any chance you took a side-by-side pic of the old extractor compared to the new? Curious to see how the geometry has changed. Also, do you have a pic of the new style feed ramp design? No words for the firing pins. Very odd... |
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Any chance you took a side-by-side pic of the old extractor compared to the new? Curious to see how the geometry has changed. Also, do you have a pic of the new style feed ramp design? No words for the firing pins. Very odd... As mentioned I had purchased another barrel/BCG combo after my initial testing of the Guard was positive. You have to look closely but the new one has a longer angled 'ramp' for it to hop of the rim of the case. CMMG initially sent me a replacement extractor and it still was not as reliable as my other BCG. I couldn't figure out any other differences and ended up having them swap out the entire BCG and now they are both running well....(as long as the ejector spring is to spec and no broken firing pins!)  I don't have a pic handy of the two different barrel extensions side by side. Basically, original looks like an M4 or standard AR extension and the later one is a single ramp for the single feed Glock mags but again, I'm having no feeding issues using the double feed Endomags with either one. |
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These are def Chinese knockoffs considering the one you linked to was $54. Come to think of it I may buy one from FabDefense to see how the quality compares. And to support US biz (unless they get theirs from China too.) EDIT: FabDefense one is slightly different and is made in Israel. |
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I'm guessing he is saying it is configurable from 7.5 to 5.5. I already tested from 2.9 through 7.4. 7.4 wouldn't lock the bolt back and was bouncy and wouldn't lock the bolt back. Also note that in my testing an H3 buffer (5.3oz) was unreliable and giving me malfunctions. Although the 9mm Hydraulic is 5.9 oz, it didn't give me problems which I'm suspecting has to do with the hydraulic dampening. Your reviews of the hydraulic buffer convinced my that I want to try one and the RB5004 looks like the only one that could work for my application. I may be able to get the same smoothness and MP5'ish feel as you did with it. Do you have any thoughts or concerns before I spring for one to try out? Thanks. |
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Do you have any thoughts or concerns before I spring for one to try out? Thanks. |
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Not really...IF you can get it working, I would expect the ROF to be too high for my tastes...I doubt you will be able to pull singles consistently...but that is my preference. You may not care about that. |
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Yes I would like to have that capability. I can pull 2's reliably (UCIW 3.1 oz buffer and flat spring) with my 5.56 upper. The Kynshot RB5004 extra weight may get the rate down a bit and allow me to pull single's. From your testing a hydraulic buffer seems like a good choice all around if I can get it to work with my Guard setup too. If you look at the previous page's on this thread, Doctor_Evil was saying that the rifle was the smoothest and the A5 was a close second with the carbine being the worst. Then on page 11 he states how he was having malfunctions every or 4 or 5 mags with the rifle buffer system. He ran a match with the same setup I'm using, A5, 9mm Blitzkrieg/Kynshot and 556 Tubb spring and he had no malfunctions. If you look at my site, I already tested the Enidine hydraulic and the Kynshot carbine (RB5000). They are both stiffer to compress than the 9mm version and they were not as smooth as running the 9mm version...I don't know if that is due to the additional stiffness or less weight or a combination of the two. Doctor_Evil's testing on page 8 mirrors mine in regards to the carbine testing as well. Rifle (longest tube) - smoothest, slowest RoF but had some reliability issues A5 - (Med tube) 2nd in terms of smoothest and RoF but reliable Carbine (short tube) - worst in smoothest and fastest RoF but reliable UICW (even shorter tube) - ? You see a pattern here? You are talking about going even shorter than carbine so logically, I can't imagine you being able to get to the point we are at going the opposite direction in buffers/springs. IF you get it working RELIABLY, I predict it will have a very high RoF and it will NOT be 'as smooth' as a carbine or A5 setup ....I'm sure smoother than straight blowback though. I want to have a setup that I can use across a large variety of uppers/configurations. If you see in the picture below, those are just some of the magwell configurations I use with my RDIAS. That little UCIW stock wouldn't work with some of them. I want a buffer tube/system that will work with everything and not have to move firecontrol parts around to different lowers. The A5 length tube allows me to do this....Actually I could do it all with a carbine length too but just not as smoothly as with the hydraulic. 
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[ARCHIVED THREAD] - Thoughts on the CMMG Guard? (Page 12 of 25)
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