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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles. |
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#1
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Malfunction: Ar Pistol
I am consistently getting double feeds on my 10.5" Ar pistol. I am using a brand new Noveske upper w/Noveske KX5. The buffer is a Spikes Tactical ST-T2 and the BCG is Fail Zero. ; 223 PMC Bronze 55gr FMJ-BT.
Hard to tell but I'm thinking its either the ammo, Buffer, or not sufficient gas pressure. I can change the ammo (62gr?), Change the buffer (Recommendations), Or mess with the gas which I don't know how to adjust. Could it be the BCG? Last edited by QuarterBoreGunner; 02-09-2015 at 9:08 AM.. |
#3
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I would check the BCG group first, most notably the extractor / extractor spring.
If the bolt is able to go all the way back to strip a new round, I don't think the buffer or insufficient gas pressure (Due to ammo) would be an issue. Last edited by Pugster; 02-07-2015 at 8:32 PM.. Reason: Ruling out buffer/ammo |
#5
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I'll be honest, I just clicked on this thread because it had "Porno" in the title
Sounds like you are having a failure to extract/eject, pretty common on pistols due to the high gas port pressure associated with pistol length gas systems. The excess pressure is most likely causing the extractor to skip over the rim of the cartridge before it is fully extracted from the chamber. The bolt continues to the rear, picks up a new round and BOOM: instant DP, or attempted DP anyway.... Best option would be to install an adjustable gas block to tune the volume of gas down enough to slow the bolt speed down so the extractor and ejector can do their jobs. Next best would be to add a heavier buffer or extra power buffer spring to attempt the same thing from the opposite side of the gas system. In either case, check your bolt to make sure the extractor has the black "Crane" O-ring installed around the extractor spring.
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U.S. Navy (Retired) 1994-2015 |
#6
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I don't think fte would be the cause unless op doesn't mean double feed(as in two live rounds)
Could be possible overgassed, if it were violent enough to jar an extra bullet out of the mag during feeding |
#7
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I had the same problem with a 10.5" pistol. It was under gased. I had to drill the gas port out from 1/16 too 3/32..
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It takes a lot of balls to play golf the way I do. Happiness is a warm gun. MLC, First 3 |
#8
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lol
BOOM: instant DP, or attempted DP anyway.... that's going in my sig.....
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#11
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Wise man. I'll wager it's this.
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#14
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I would first start my trouble shooting with a single round in the mag and check to see if the bolt locks back, do a couple of these. if the bolt locks back then it's most likely over gassed and a adjustable gas block would fix this issue. If it does not lock back, your under gassed and the two possibilities could be you need to drill the gas port out more or check your bolt carriers gas rings and see if they need to be replaced. Easy way to check is just pull your bolt carrier out, extend the extractor out and stand it on a flat surface if the carrier comes down on the bolt replace the rings. It does help also to check as others have stated the extractor spring for that o ring. I hope this helps good luck
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#15
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This. It's possible that your extractor is bouncing right over the casing rim due to the fast cycling speed. Not uncommon in short barrels ARs. Try an extractor spring crane o-ring
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#17
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PMC 223A is underpowered ammo. Try XM193 Federal or equivalent. Proceed to the following if no joy. Use a known good mag. X2 feeds = 2 rounds trying to get in the chamber. aka PORN Unscrew KX5 and retest with it off. KX5 increases dwell. Try standard carbine buffer/spring combo and retest.
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#19
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ttt
Last edited by powderedtoastman; 06-05-2016 at 11:28 AM.. |
#20
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Quote:
Last edited by HotelCommiefornia; 02-08-2015 at 1:10 PM.. |
#21
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Dang it! That porn always gets me.
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The wise man said just find your place In the eye of the storm Seek the roses along the way Just beware of the thorns... K. Meine |
#22
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PMC Bronze chonographed 2600 (give or take) in my 16" AR while XM193 was closer to 3200fps. The PMC is a very mild round and is far from the best choice in an AR pistol. Try 556 and see what happens.
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#23
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I've crono'd pmc at 2900 and lake city 556 at 3200.
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NRA Lifetime Member 1A-2A = -1A |
#24
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My "El Cheapo" Radical Firearms 10.5 AR pistol runs like a top with every type of ammo I've fed it. I feel bad for folks with high end builds that don't work right.
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