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Posted: 4/14/2024 1:20:21 PM EDT
[#1]
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Posted: 4/14/2024 1:36:45 PM EDT
[Last Edit: Postal0311]
[#2]
Quote HistoryOriginally Posted By doc_Zox: https://store-cmxe8vp0pm.mybigcommerce.com/blem-premiere-manufacturing-ar-15-bolt-carrier-group-black-nitride/ $55 BCG JUMPBACK5 for more off. Sadly, their checkout doesn't work for me. They have emailed me 7 times telling me that I left items in my cart, but they won't let me check out. Their system won't let me log in either. |
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Posted: 4/14/2024 2:06:25 PM EDT
[Last Edit: Klee]
[#3]
Originally Posted By Spade:  https://www.youtube.com/watch?v=uC36sE5YxfgThis seems quite interesting. OMG!!!  How in the hell did I miss this thread until today? |
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Posted: 4/14/2024 2:27:17 PM EDT
[#4]
Quote HistoryOriginally Posted By doc_Zox: A clever man might print this in wax and bronze vacuum cast the final parts https://machinablewax.com/wax-filament/ What about lost PLA and cast it in aluminum? |
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Posted: 4/14/2024 3:11:55 PM EDT
[#5]
Beer cans to buzz gun
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Posted: 4/14/2024 3:37:34 PM EDT
[#6]
Quote HistoryOriginally Posted By Postal0311: JUMPBACK5 for more off. Sadly, their checkout doesn't work for me. They have emailed me 7 times telling me that I left items in my cart, but they won't let me check out. Their system won't let me log in either. Try a different browser. |
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Posted: 4/14/2024 3:38:14 PM EDT
[#7]
Quote HistoryOriginally Posted By Klee: What about lost PLA and cast it in aluminum? Quote HistoryOriginally Posted By Klee: Originally Posted By doc_Zox: A clever man might print this in wax and bronze vacuum cast the final parts https://machinablewax.com/wax-filament/ What about lost PLA and cast it in aluminum? Pla is supposed to have more ash. I don't know in practicality though, I've never cast anything |
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Posted: 4/14/2024 11:27:38 PM EDT
[#8]
Some more progress over the weekend. The receiver is mostly complete so I've moved on to the barrel cluster.
   
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Posted: 4/15/2024 6:30:07 AM EDT
[#9]
Quote HistoryOriginally Posted By Rat_Patrol: Try a different browser. Tried 3 browsers on 2 different computers and a phone. On all of them it would not load the payment processor. To add insult to injury they emailed me 8 times telling me that I left things in my cart and I should check out. Screw em, I'll buy from someone else. |
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Posted: 4/15/2024 7:49:00 AM EDT
[Last Edit: AFCarbon15]
[#10]
Quote HistoryOriginally Posted By Postal0311: Tried 3 browsers on 2 different computers and a phone. On all of them it would not load the payment processor. To add insult to injury they emailed me 8 times telling me that I left things in my cart and I should check out. Screw em, I'll buy from someone else. RTB has BCG's for $56 |
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Posted: 4/15/2024 8:37:58 AM EDT
[#11]
Quote HistoryOriginally Posted By AFCarbon15: RTB has BCG's for $56 That is who we are talking about. |
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Posted: 4/15/2024 10:20:55 AM EDT
[#12]
I bought 6 complete BCGs from Bear Creek for 434 shipped. Figured I would sell the carrier, clip and gas rings.
The bolt/FP/cam all get hacked up, so there's no $ to recover here when the project goes sideways. They arrived in like 2 days no drama. I had issues with the Schuyler Arms website for the barrels. It didn't like my AMEX, then typoed my visa card so it locked me out for an hour. Got the order placed and it was radio silence for a week or so then they shipped. total for 6 12.5" AeroPrecision barrels was $375. These I can flip fairly easily to recover some money if needed. Biiiig bearing came from Ali Express for like $65. Fits fine. Lots of misc orders for things. I'm in it for at least 1000 total so far. |
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Posted: 4/16/2024 8:42:13 AM EDT
[#13]
TAG!
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Posted: 4/16/2024 8:46:41 AM EDT
[Last Edit: Ozymandiaz]
[#14]
For those building this beast, I'm testing a 1" OD X .25" wall aluminum tube instead of the solid 1" round bar for the center rod of the barrel cluster. It seems to work just as well and cuts a noticeable amount of weight. Titanium tube would probably work even better but ratchets up the cost quite a bit. Easier to drill the mounting holes accurately as well with the tube for those without a shop.
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Posted: 4/16/2024 7:57:24 PM EDT
[#15]
Quote HistoryOriginally Posted By Ozymandiaz: For those building this beast, I'm testing a 1" OD X .25" wall aluminum tube instead of the solid 1" round bar for the center rod of the barrel cluster. It seems to work just as well and cuts a noticeable amount of weight. Titanium tube would probably work even better but ratchets up the cost quite a bit. Easier to drill the mounting holes accurately as well with the tube for those without a shop. I wondered why he chose a solid rod instead of a tube. I already have the rod and thought about boring it out. |
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Posted: 4/16/2024 8:07:35 PM EDT
[#16]
I'm cutting weight wherever reasonable, also trying for better balance. I have some 3mm wall carbon fiber tubes on the way from Ali Express to test for the barrel cluster shaft and for the tripod legs. I didn't think carbon fiber would work for the barrel cluster so I also got the.25" wall aluminum tube and it works just fine in case the lightweight carbon tube doesn't.
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Posted: 4/16/2024 8:24:11 PM EDT
[#17]
Quote HistoryOriginally Posted By jm0502: Only thing im not liking is the use of printed links vs the dime a dozen M27 links Problem is, once word gets out, the links will disappear just like the grease gun mags. |
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Posted: 4/16/2024 8:49:04 PM EDT
[#18]
I got my delinker assembled and ran a belt through it. Sometimes it wants to jam up and I'm going to have to smooth it out.
Finally printing the last big piece, the crank housing. After that I should be able to get the entire thing together. |
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Posted: 4/16/2024 8:55:26 PM EDT
[#19]
Now that my order has shipped, the cheapest bolts suitable for this project that I've found are at MAF Arms. $43 for an entire BCG (blem). The issues with gas rings / seals are irrelevant here because we're chopping up the bolt anyways and the rest goes into a parts bin for later.
There's also random stripped bolts for $10 but I wasn't able to catch it in stock when I was ready to order bolts and buying the extractors, firing pins, etc brought the price up high enough that the MAF blem BCGs made more sense. |
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Posted: 4/16/2024 9:23:38 PM EDT
[#20]
I know zilch about 3D printers but that thing is GLORIOUS
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Posted: 4/16/2024 10:43:11 PM EDT
[Last Edit: jestertoo]
[#21]
I really need to work on the printer and figure out the banding.
Changing to sharpest corner instead of random for the starting point def helped the outer appearance.   
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Posted: 4/17/2024 8:23:02 AM EDT
[#22]
https://www.righttobear.com/m16-ar15-bolt-9310-mpi-5-56-black-nitride-sbn-bolt-9310
Quantity in Stock: IN STOCK MSRP: $50.00 SALE PRICE: $44.95 |
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Posted: 4/20/2024 3:18:22 PM EDT
[#23]
Making progress. Should have the crank finished tonight. I'm about ready to mount barrels, maybe also do that tonight.
 
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Posted: 4/20/2024 9:31:44 PM EDT
[#24]
I got on a roll
    
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Posted: 4/20/2024 9:34:16 PM EDT
[#25]
That's awesome
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Posted: 4/20/2024 10:14:25 PM EDT
[#26]
I'm mostly done with the gun part, waiting on carbon fiber tubes for the tripod. I found that a 3d printed bolt cam pin (carbon fiber nylon 100% infill) works perfectly and it's a lot easier than cutting / grinding the right shape on regular steel pins. I don't think these pins are bearing any load even in firing because the roller bearing cam track locks and unlocks the bolt. I can always cut the real pins down later but I'm using the printed version for now for consistency in testing.
I had to modify the receiver file to add a frame for a serial number plate, but thankfully I'm an 07 FFL with laser engravers so that part is easy and keeps my dog from being shot here in Washington. Funnily enough this monster is legal here because it's not a semi auto but a m&p 15-22 isn't...  
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Posted: 4/20/2024 10:35:50 PM EDT
[#27]
Quote HistoryOriginally Posted By Ozymandiaz: I found that a 3d printed bolt cam pin (carbon fiber nylon 100% infill) works perfectly and it's a lot easier than cutting / grinding the right shape on regular steel pins. I don't think these pins are bearing any load even in firing because the roller bearing cam track locks and unlocks the bolt. I can always cut the real pins down later but I'm using the printed version for now for consistency in testing. Can you share your STL? Also, I'm working on an idea for using tungsten in the striker to improve it's mass and help with the light strikes issue. Could make it entirely out of some type of tungsten alloy and grind the pin hole for it, or do some type of striker insert. |
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Posted: 4/20/2024 10:50:03 PM EDT
[#28]
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Posted: 4/20/2024 11:00:30 PM EDT
[#29]
sorry, don't want to interrupt this thread, just a lurker.
I've read the stuff I could find on the various seas and r/s. How does this not get hot enough to melt? I never thought to touch one after firing, just assumed it would burn me. I honestly would think that if it came out of a 3d printer, if you left it in your car it would melt on its' own. (I'm very ignorant of the topic, I suppose). I've seen injection molding, but that is a ton of heat and pressure. |
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Posted: 4/20/2024 11:05:40 PM EDT
[#30]
I'm printing anything forward of the bolts with carbon fiber nylon which has a ~400 degree heat tolerance. Everything else on mine is carbon fiber PETG which has around 200 degree tolerance. The only PLA+ I used was for the doors / covers which didn't need any real mechanical strength (even Kel-tec plastic would work for that stuff).
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Posted: 4/20/2024 11:36:29 PM EDT
[Last Edit: jestertoo]
[#31]
Quote HistoryOriginally Posted By high_order1: How does this not get hot enough to melt? I never thought to touch one after firing, just assumed it would burn me. Under sustained fire I'm sure it would get hot enough to melt stuff. The beauty of 6 barrels is you can run it slow and let it cool itself. I wonder how long it will be until someone 3d prints it out of metal :) |
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Posted: 4/21/2024 12:41:30 AM EDT
[Last Edit: high_order1]
[#32]
Quote HistoryOriginally Posted By jestertoo: Under sustained fire I'm sure it would get hot enough to melt stuff. The beauty of 6 barrels is you can run it slow and let it cool itself. I wonder how long it will be until someone 3d prints it out of metal :) edit - wonder if anyone has sent them to one of the online services? |
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Posted: 4/21/2024 12:43:42 AM EDT
[#33]
This thing is already heavier than a Barrett, metal casting these thick pieces intended for plastic would turn it into a vehicle towed gun
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Posted: 4/21/2024 1:05:38 AM EDT
[#34]
Quote HistoryOriginally Posted By Ozymandiaz: This thing is already heavier than a Barrett, metal casting these thick pieces intended for plastic would turn it into a vehicle towed gun |
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Posted: 4/21/2024 8:49:31 AM EDT
[Last Edit: jestertoo]
[#35]
Quote HistoryOriginally Posted By Ozymandiaz: This thing is already heavier than a Barrett, metal casting these thick pieces intended for plastic would turn it into a vehicle towed gun So true. If it was designed to be 3d printed from metal, most of the stuff could be made a lot thinner. Did you see the Picatinny rail top cover ? https://odysee.com/@Nopel:6/gripFrameUpper-with-pic-rail:6 |
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Posted: 4/21/2024 8:54:21 AM EDT
[#36]
I have the pic rail top, but haven't used it because I have no idea what sort of optic I'd put on this thing or if it would even be useful. I might remix the ring sight version to include a pic rail and reprint, or just epoxy one onto what I already have.
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Posted: 4/21/2024 9:53:22 AM EDT
[#37]
Quote HistoryOriginally Posted By Ozymandiaz: I have the pic rail top, but haven't used it because I have no idea what sort of optic I'd put on this thing or if it would even be useful. I might remix the ring sight version to include a pic rail and reprint, or just epoxy one onto what I already have. I have to get it shooting first :) I started printing the mount. Will start working ont he cam pins today. Gonna try yours before I start grinding. |
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Posted: 4/22/2024 12:37:45 PM EDT
[#38]
Quote HistoryI printed these out in PLA (it's what I have) to test fit with and they are working pretty nice. One of my printers makes everything slightly by like a hundredth of an inch, so I'm having to file/sand everything. |
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Posted: 4/22/2024 3:18:41 PM EDT
[#39]
Quote HistoryOriginally Posted By jestertoo: I printed these out in PLA (it's what I have) to test fit with and they are working pretty nice. One of my printers makes everything slightly by like a hundredth of an inch, so I'm having to file/sand everything. https://teachingtechyt.github.io/calibration.html |
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Posted: 4/22/2024 9:54:06 PM EDT
[#40]
I got the bolts/bolt carriers cycling correctly tonight.
It doesn't like feeding m200 blanks through the delinker, so I've ordered some 1pc dummy rounds to try. It definitely does NOT like being run in reverse, even with nothing at all in it. |
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Posted: 4/22/2024 9:58:00 PM EDT
[#41]
You might have rough spots in your cam grooves for either the receiver or de-linker if it won't spin in reverse (assuming the anti reverse lever is pressed anyways). Or possibly a bolt hitting the safety sear in a bad spot?
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USA
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Posted: 4/22/2024 10:07:42 PM EDT
[#42]
Quote HistoryOriginally Posted By jm0502: Only thing im not liking is the use of printed links vs the dime a dozen M27 links Agreed. We badly need a version that runs M27 links. They are cheap, available, and don’t require any print time. Especially for those of us with many thousands of linked 5.56 for other toys already. I love the printable capability of the links as designed, but if it can be altered to capitalize on an easy-button resource, let’s do it! Glad to see these beta versions coming together! Looks great! |
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Posted: 4/23/2024 1:08:51 AM EDT
[#43]
I might get a batch of the links 3d printed in metal for giggles, they'd be interesting in titanium!
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Posted: 4/23/2024 9:47:12 AM EDT
[#44]
Quote HistoryOriginally Posted By Ozymandiaz: I might get a batch of the links 3d printed in metal for giggles, they'd be interesting in titanium! I'll buy a few from you if you do this. J |
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Posted: 4/23/2024 9:49:23 AM EDT
[#45]
Quote HistoryOriginally Posted By Ozymandiaz: You might have rough spots in your cam grooves for either the receiver or de-linker if it won't spin in reverse (assuming the anti reverse lever is pressed anyways). Or possibly a bolt hitting the safety sear in a bad spot? De-linker is good in reverse. I ran it with a drill quite a bit figuring out some issues with it. I suspect it's a bolt hitting something since it doesn't feel like a "slow bind" but a hard stop. |
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Posted: 4/23/2024 9:51:37 AM EDT
[Last Edit: jestertoo]
[#46]
Quote HistoryOriginally Posted By TyrannyOfTheMinority: Agreed. We badly need a version that runs M27 links. They are cheap, available, and don’t require any print time. Especially for those of us with many thousands of linked 5.56 for other toys already. I love the printable capability of the links as designed, but if it can be altered to capitalize on an easy-button resource, let’s do it! Quote HistoryOriginally Posted By TyrannyOfTheMinority: Originally Posted By jm0502: Only thing im not liking is the use of printed links vs the dime a dozen M27 links Agreed. We badly need a version that runs M27 links. They are cheap, available, and don’t require any print time. Especially for those of us with many thousands of linked 5.56 for other toys already. I love the printable capability of the links as designed, but if it can be altered to capitalize on an easy-button resource, let’s do it! Yes, and no. I see a couple of problems with m27 links (I use them on my shrike) 1) amount of force to push the round out - softer/smoother since this thing is hand cranked and made of plastic 2) spacing between the links is REALLY tight. I imagine the de-linker could be redesigned for m27 links, but it would be tough. |
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Posted: 4/23/2024 9:53:35 AM EDT
[#47]
Mark the barrel where the stoppage happens and see if it's consistent, I checked mine (without strikers installed since that's the last part I'm working on) and it rotated freely both directions as long as I disengaged the anti reverse lever. Less likely, but your anti reverse may also be protruding into the clutch if the spring is too tall / strong.
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Posted: 4/23/2024 9:54:41 AM EDT
[Last Edit: jestertoo]
[#48]
Quote HistoryOriginally Posted By Ozymandiaz: Mark the barrel where the stoppage happens and see if it's consistent, I checked mine (without strikers installed since that's the last part I'm working on) and it rotated freely both directions as long as I disengaged the anti reverse lever. Less likely, but your anti reverse may also be protruding into the clutch if the spring is too tall / strong. I'll mark position next chance I get. It does it without the de-linker even attached. Don't think it's the anti-reverse pawl. |
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Posted: 4/23/2024 12:26:02 PM EDT
[#49]
You guys are my heros!
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Posted: 4/23/2024 7:07:59 PM EDT
[Last Edit: Ozymandiaz]
[#50]
Well damn, here I was worried about getting depths and tolerance/ fit correct on the strikers, but realized it's WAY easier to just drill the striker rod all the way through and tap the sucker 1/4-20. I'll then use a stainless 1/4-20 bolt for the bearing pin. I'll still turn down the bearing pin on the lathe but the portion attached to the striker will be threaded and that gives it some adjustability on the height. Some blue locktite and it should stay where it needs to without being locked in place should I need to remove a bolt.
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