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Posted: 5/8/2015 2:39:41 PM EDT
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Sorry if this has been asked before but I didn't have luck with a search. What buffer would be best for a 10.5" 300 BLK with a pistol gas system? It will be run suppressed. Right now I have a standard carbine buffer in it but have read that an H2 can smooth out the cycling and reduce some noise at the ejection port. Thanks for any info.
ETA: So far I've only shot it unsuppressed as a pistol since I'm waiting on my Form 1 and Form 4 stamps and it ran fine. |
| Imho, get an adjustable gas block. I have a 10.5" .300 Blkout, running with a carbine buffer in a SBR set-up, and it runs fine. Adjusting the gas pressure is the best (cheapest) way to control ejection and battering of the upper. I'm waiting for the Form 3 to clear, so can't speak to how it would run canned. |
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Quoted:
Imho, get an adjustable gas block. I have a 10.5" .300 Blkout, running with a carbine buffer in a SBR set-up, and it runs fine. Adjusting the gas pressure is the best (cheapest) way to control ejection and battering of the upper. I'm waiting for the Form 3 to clear, so can't speak to how it would run canned. Everything I have read says 300 blackout does not need or require an adjustable gas block if you have a quality barrel that has the correct size gas port. But as you said I just finished my 10.2 inch 300 blackout build and I have not had a chance to shoot it. Mine is only going to be used suppressed and I have a JP silent capture spring in it. |
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No it is not 'needed'....just like a free float handguard isn't needed while plastic hanguards work just fine... There are a lot of variables and they vary when changing barrel lengths, gas system lengths and ammo. First of all you have 4 different configurations: 1. Minimum Port Size Unsuppressed with Subsonic Ammo 2. Minimum Port Size Suppressed with Subsonic Ammo 3. Minimum Port Size Unsuppressed with Supersonic Ammo 4. Minimum Port Size Suppressed with Supersonic Ammo If you go with a 16" barrel and pistol length gas, the port size to function on config 4 is .059 while 1 and 2 both required .067. That amount of difference is not worth it for most users to go adjustable....however the manufacturer of that barrel ported it at .089 when it doesn't need to be that big so you could have a .089 port in the block for adverse conditions. Look at the data for a 9.5" barrel. Minimum port size to run config 1 or 2 was .093 for most ammo tested. While running config 3 was .073 and .067 for config 4. That 20 thousandths difference in port size is noticeable with excess fouling into the action and increased recoil....but will it run the supersonic at the larger .093 port size? Of course it will work but it will be overgassed. Everyone is different with different requirements and preferences. If you mainly shoot subsonic and only on occasion run supersonic then don't both going adjustable. You may want to consider adjustable if you reload, like to the ability to shut the gas off, have an adverse mode or simply want to know your rifle is perfectly tuned. |
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Quoted: Advertisement? I already stated that going adjustable isn't for everyone. But that is fine if you want to call it an advertisement.....of all the people on this thread I anticipated you would have a remark like that. We pay our dealer membership fees to place ads here but I think it is more helpful to post in technical discussions. BTW: here is the link to our 300BLK port size testing: http://micromoa.com/300-blk-port-size-testing/ I you just READ the first sentence on that web page it states, "We’ve had requests for a Govnah setup for 300 BLK. We know that Remington/AAC states that this round doesn’t need an adjustable gas block and for most people we would agree with that." That said, we still sell quite a few blocks to people running 300BLK for the reasons I stated earlier. |
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Good points. To each his own. I just hate to see money wasted on what I see as unneeded. I only see it as unneeded because of extensive research. But as you said someone else might either be ignorant of the facts or like a perfectly tuned AR 300 blackout rifle.
I have read many great reviews on your product and honestly I would try it on my 5.56 AR15 if I didn't already have an innovative arms war upper. Quoted:
More of an education of facts that we have documented. Note that I didn't even name our product in the post. I already stated that going adjustable isn't for everyone. But that is fine if you want to call it an advertisement.....of all the people on this thread I anticipated you would have a remark like that. We pay our dealer membership fees to place ads here but I think it is more helpful to post in technical discussions. BTW: here is the link to our 300BLK port size testing: http://micromoa.com/300-blk-port-size-testing/ I you just READ the first sentence on that web page it states, "We’ve had requests for a Govnah setup for 300 BLK. We know that Remington/AAC states that this round doesn’t need an adjustable gas block and for most people we would agree with that." That said, we still sell quite a few blocks to people running 300BLK for the reasons I stated earlier. Quoted:
Quoted:
Advertisement? BTW: here is the link to our 300BLK port size testing: http://micromoa.com/300-blk-port-size-testing/ I you just READ the first sentence on that web page it states, "We’ve had requests for a Govnah setup for 300 BLK. We know that Remington/AAC states that this round doesn’t need an adjustable gas block and for most people we would agree with that." That said, we still sell quite a few blocks to people running 300BLK for the reasons I stated earlier. |
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Man you should have linked back to the 300 blk testing on your page on your first it is a good read.
I'd be interested in some testing on a short noveske barrel Quoted:
More of an education of facts that we have documented. Note that I didn't even name our product in the post. I already stated that going adjustable isn't for everyone. But that is fine if you want to call it an advertisement.....of all the people on this thread I anticipated you would have a remark like that. We pay our dealer membership fees to place ads here but I think it is more helpful to post in technical discussions. BTW: here is the link to our 300BLK port size testing: http://micromoa.com/300-blk-port-size-testing/ I you just READ the first sentence on that web page it states, "We’ve had requests for a Govnah setup for 300 BLK. We know that Remington/AAC states that this round doesn’t need an adjustable gas block and for most people we would agree with that." That said, we still sell quite a few blocks to people running 300BLK for the reasons I stated earlier. Quoted:
Quoted:
Advertisement? BTW: here is the link to our 300BLK port size testing: http://micromoa.com/300-blk-port-size-testing/ I you just READ the first sentence on that web page it states, "We’ve had requests for a Govnah setup for 300 BLK. We know that Remington/AAC states that this round doesn’t need an adjustable gas block and for most people we would agree with that." That said, we still sell quite a few blocks to people running 300BLK for the reasons I stated earlier. |
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I run a PSA 10.5 CHF rifle using a Spikes T3 buffer and Spikes 17-7 buffer spring, and it shoots soft for an SBR. It ran suppressed like a champ. The setup was just a SWAG, and I think I'm getting the feel for this Black Rifle thing.
I shot on Friday at Red's and both the above referenced SBR, and my PSA CHF Dissipator ran perfectly using a Spikes T2 buffer and Springco Blue spring. No sproing on either rifle, in fact no noticeable sound from either of the buffer tubes. I used Brownells .223 laser bore sight for the BUIS and red dot sights, and required minimal adjustments for my initial 50 yard zero on both rifles. I will wait until the rain stops here, and hit an outdoor range for the final 100 yard zero on both guns. Red's is just too dark for my liking to get an accurate timely zero, I don't want to burn through ammo unless necessary. The targets were visible, but I couldn't see the center dot clearly, probably from the fan blowing air all over me, and substandard lighting. I use the SSS QD Brake Shield sold by Weapon Outfitters, and they did a great job at directing the concussive forces forward, mind you it still sounded like a cannon going off compared to whatever the other shooters on the range were using. Sorry for the thread hijack, but to answer the OP's question, I use several different buffer/spring combinations depending on the barrel length, intended usage, and a few other factors. I don't run an adjustable gas block any any of my rifles, haven't had the need. So far I've yet to experience any malfunctions, or problems of any kind with either AR15 (suppressed or unsuppressed), varying from 10.5" to 18" barrels. I only own 5 AR15's, so it's relatively easy to keep each rifles configuration in my head. Hell, I should have read more .300 BO, sorry I only am shooting 5.56. |
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Lol long post to just say wrong caliber. I do not agree with 5.56 AR15 suppressed without some kind of gas adjustment. You will be very over gassed while shooting suppressed.
And I agree the JP silent capture spring in my 5.56 does not sound any different than the normal spring with suppressed or unsuppressed. But I account most of that due to the fact I wear ear pro either way. But I do notice the recoil changes with the JP spring it feels much smoother. I will let you know how it sounds on my 300 blackout suppressed in two weeks. Quoted:
I run a PSA 10.5 CHF rifle using a Spikes T3 buffer and Spikes 17-7 buffer spring, and it shoots soft for an SBR. It ran suppressed like a champ. The setup was just a SWAG, and I think I'm getting the feel for this Black Rifle thing. I shot on Friday at Red's and both the above referenced SBR, and my PSA CHF Dissipator ran perfectly using a Spikes T2 buffer and Springco Blue spring. No sproing on either rifle, in fact no noticeable sound from either of the buffer tubes. I used Brownells .223 laser bore sight for the BUIS and red dot sights, and required minimal adjustments for my initial 50 yard zero on both rifles. I will wait until the rain stops here, and hit an outdoor range for the final 100 yard zero on both guns. Red's is just too dark for my liking to get an accurate timely zero, I don't want to burn through ammo unless necessary. The targets were visible, but I couldn't see the center dot clearly, probably from the fan blowing air all over me, and substandard lighting. I use the SSS QD Brake Shield sold by Weapon Outfitters, and they did a great job at directing the concussive forces forward, mind you it still sounded like a cannon going off compared to whatever the other shooters on the range were using. Sorry for the thread hijack, but to answer the OP's question, I use several different buffer/spring combinations depending on the barrel length, intended usage, and a few other factors. I don't run an adjustable gas block any any of my rifles, haven't had the need. So far I've yet to experience any malfunctions, or problems of any kind with either AR15 (suppressed or unsuppressed), varying from 10.5" to 18" barrels. I only own 5 AR15's, so it's relatively easy to keep each rifles configuration in my head. Hell, I should have read more .300 BO, sorry I only am shooting 5.56. |
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