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AR15 BCG Problem
#5273649
08/26/14 11:19 PM
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Joined: Sep 2005
Posts: 2,015
Furb
OP
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OP
Veteran Tracker
Joined: Sep 2005
Posts: 2,015 |
Ok, so I just finished my SBR and first shot out the gun the BCG stuck on ejection, ripped the case head off leaving the casing in the chamber, caulked it up to either bad chamber or cheap steel ammo. Fast forward to a few minutes ago when I tried to cycle the weapon with a loaded mag.
BCG cycles fine without rounds but as soon as you put a loaded mag into the weapon and chamber a round, its goes to battery fine, trying to eject the round is very difficult, difficult to the point of having to tap on the CH with hammer to eject the round. Tried a separate BCG thinking bad chamber but the other BCG cycles fine with rounds in the mag so its down to the BCG, probably down to the bolt. So any ideas guys.
HHUUMMMM, what to write, what to write, I got nothing.
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Re: AR15 BCG Problem
[Re: Furb]
#5273657
08/26/14 11:23 PM
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Joined: Aug 2011
Posts: 859
RTF Rob
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sounds like bolt/bcg issue, probably out of spec bolt causing head spacing issue
did you swap the bolts in the bcg and try that, maybe narrow it down the bolt.
Last edited by RTF Rob; 08/26/14 11:23 PM.
* One “Aw-Sh*t” wipes out ALL “At-A-Boys” The difference between shooting and soothing is one "H"'s placement.
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Re: AR15 BCG Problem
[Re: Furb]
#5273665
08/26/14 11:27 PM
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Joined: Oct 2013
Posts: 541
Gwood88
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Need a little more info. Did you build it yourself, buy the upper, or have it assembled at a smith? It sounds like either a barrel/barrel extension head spacing issue or a BCG issue. Edit: Just actually finished reading your entire post . Already ruled out the barrel and extension in your first post. I would try swapping the bolts and carriers. That should narrow it down to what is out of spec.
Last edited by Gwood88; 08/26/14 11:30 PM.
Texas A&M Class of 2011
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Re: AR15 BCG Problem
[Re: Furb]
#5273678
08/26/14 11:34 PM
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Joined: Aug 2011
Posts: 6,179
Tactical Cowboy
THF Trophy Hunter
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THF Trophy Hunter
Joined: Aug 2011
Posts: 6,179 |
I think the shoulder on ammo may be long, or you may have a tight chamber.
The secret to a long life is to try not to shorten it.
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Re: AR15 BCG Problem
[Re: Tactical Cowboy]
#5273807
08/27/14 01:02 AM
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Joined: Nov 2010
Posts: 5,275
jeepercreeper
THF Trophy Hunter
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THF Trophy Hunter
Joined: Nov 2010
Posts: 5,275 |
you may have a tight chamber. Sounds a little ghey
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Re: AR15 BCG Problem
[Re: Furb]
#5273844
08/27/14 01:28 AM
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Joined: Apr 2009
Posts: 5,562
Slow Drifter
THF Trophy Hunter
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THF Trophy Hunter
Joined: Apr 2009
Posts: 5,562 |
Any unusual marks on the sticky bolt carrier group?
"I have no idea what WW-III will be fought with, but WW-IV will be fought with sticks and stones." A. Einstein
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Re: AR15 BCG Problem
[Re: Furb]
#5273879
08/27/14 01:45 AM
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Joined: Oct 2007
Posts: 435
rvrrat14
Bird Dog
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Bird Dog
Joined: Oct 2007
Posts: 435 |
Lube the sh#t out of it and hand cycle a couple hundred times. Slicken things up a bit.
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Re: AR15 BCG Problem
[Re: RTF Rob]
#5274043
08/27/14 02:59 AM
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Joined: Sep 2005
Posts: 2,015
Furb
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sounds like bolt/bcg issue, probably out of spec bolt causing head spacing issue
did you swap the bolts in the bcg and try that, maybe narrow it down the bolt. Swapped the bolt between BCGs and had the same problem so it had to be the bolt, more is has to be the extractor, so I used my reloading Micrometer to measure make a few measurements and nothing seemed out of spec but the back nub of the extractor just looked to tall, so I got out the old lansky knife sharpening kit and honed the nub down a bit, still sticky when cycling through a maf but not near as difficult to cycle, will hone a little more off and try again. Thanks for all the ideas guys will update if successful.
HHUUMMMM, what to write, what to write, I got nothing.
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Re: AR15 BCG Problem
[Re: Furb]
#5274381
08/27/14 01:08 PM
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Joined: Jun 2014
Posts: 329
bside
Bird Dog
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Bird Dog
Joined: Jun 2014
Posts: 329 |
I would not take this approach. You're talking about a possibly out of spec bolt and with that a possibly nonstandard headspacing with that. I would rather send it back, or just replace it. A new bolt is only $40-70. Here's one for 60. Headspace is not something I would mess with.
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Re: AR15 BCG Problem
[Re: bside]
#5274869
08/27/14 05:33 PM
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Joined: Aug 2011
Posts: 859
RTF Rob
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I would not take this approach. You're talking about a possibly out of spec bolt and with that a possibly nonstandard headspacing with that. I would rather send it back, or just replace it. A new bolt is only $40-70. Here's one for 60. Headspace is not something I would mess with. what he said.
* One “Aw-Sh*t” wipes out ALL “At-A-Boys” The difference between shooting and soothing is one "H"'s placement.
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Re: AR15 BCG Problem
[Re: Furb]
#5275085
08/27/14 07:43 PM
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Joined: Sep 2005
Posts: 2,015
Furb
OP
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OP
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Pretty sure it is not a head space issue as the other BCG worked fine and when I swapped the bolts between BCGs it was the bolt that caused the hang up, but to err on the side of caution I took ya'll's advice and have contacted the manufacturer of the BCG to see what they want me to do.
Thanks again guys for the help.
HHUUMMMM, what to write, what to write, I got nothing.
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Re: AR15 BCG Problem
[Re: Furb]
#5279769
08/30/14 05:49 AM
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Joined: Aug 2007
Posts: 225
Ponyboy
Woodsman
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Woodsman
Joined: Aug 2007
Posts: 225 |
Some bolts are just really tight when new. It's actually the gas ring fit inside the carrier. You can usually tell by taking the BCG out and pushing the bolt into the carrier and then pulling it back out and comparing that to a known good working bolt.
Usually just lubing the hell out of the bolt and inside the carrier and working it back and forth a bit will loosen it up enough that it'll work and it'll feel a lot better after you put a few rounds through it.
You can check headspace if you have the gauges but I doubt that's your problem.
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