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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 02-07-2015, 8:23 PM
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Default 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..
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  #2  
Old 02-07-2015, 8:29 PM
Lexustech48 Lexustech48 is offline
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what magazine are you using?
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  #3  
Old 02-07-2015, 8:30 PM
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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
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  #4  
Old 02-07-2015, 8:34 PM
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Yep check the mag, usually that's the culprit
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Old 02-07-2015, 8:35 PM
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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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  #6  
Old 02-07-2015, 8:39 PM
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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
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Old 02-07-2015, 8:51 PM
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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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Old 02-07-2015, 9:00 PM
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lol
BOOM: instant DP, or attempted DP anyway....
that's going in my sig.....
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Old 02-07-2015, 9:16 PM
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Had the same problem after switching gas blocks on my 14.5"...under gassed. Either the Block isn't lined up or the hole needs to be bigger
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Old 02-07-2015, 10:28 PM
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Why does it have an extra heavy buffer to start with?
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Old 02-07-2015, 10:46 PM
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Quote:
Originally Posted by davidb View Post
Yep check the mag, usually that's the culprit
Wise man. I'll wager it's this.
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  #12  
Old 02-07-2015, 11:48 PM
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Could be not enough dwell time so the casing could be extracted from the chamber. Then a new round is shoved into the bottom of the other round.

What does the brass look like?
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Old 02-08-2015, 12:44 AM
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Old 02-08-2015, 2:00 AM
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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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Old 02-08-2015, 6:23 AM
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Quote:
Originally Posted by Pugster View Post
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.
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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  #16  
Old 02-08-2015, 8:59 AM
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Tune your gas system
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  #17  
Old 02-08-2015, 10:18 AM
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Quote:
Originally Posted by MKUltra View Post
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?
Start by changing ammo.

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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Old 02-08-2015, 11:16 AM
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You would think a conplete noveske upper would work Out the box. Try some new mags, if that doesn't fix it id get a return label before throwing other parts on it
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  #19  
Old 02-08-2015, 12:11 PM
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ttt
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Last edited by powderedtoastman; 06-05-2016 at 11:28 AM..
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  #20  
Old 02-08-2015, 1:04 PM
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Quote:
Originally Posted by FMJBT View Post
I'll be honest, I just clicked on this thread because it had "Porno" in the title
I also did the same, what a disappointment, must be a pre-mature eject issue, that's what happens when you hit middle age. Try this to fix the problem before you call the manufacturers, it may not be their faults at all


Last edited by HotelCommiefornia; 02-08-2015 at 1:10 PM..
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  #21  
Old 02-08-2015, 1:12 PM
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Dang it! That porn always gets me.
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Old 02-08-2015, 6:20 PM
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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  
Old 02-09-2015, 10:04 PM
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Quote:
Originally Posted by sammy View Post
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.
I've crono'd pmc at 2900 and lake city 556 at 3200.
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  #24  
Old 02-10-2015, 3:10 AM
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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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