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

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  #1  
Old 08-14-2018, 12:56 PM
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Default Bolt won’t lock back after last shot.

Hey y’all,
Been searching a bit and couldn’t find an answer. I have a joe bob bcg which I got as a gift. Took it to the range the other day and wouldn’t stay locked back after the last shot. Used it on 2 rifles and still had the problem. This time I brought a bcm bcg and it locked with no issue. What could the problem be?

Thanks in advance.
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Old 08-14-2018, 1:02 PM
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Leaking gas key, wore out gas rings, not enough lube on the BCG, blocked gas key, etc.

One thing I have found is the one piece gas ring has been a problem for myself and one other person I know.
Switched to the old three ring gas rings and issue went away.

If the rifle works as it should, then the new BCG is suspect.

.
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It makes it bigger and longer.
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Old 08-14-2018, 1:39 PM
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Different bc types (ar15 vs m16)? A freind had a simular problem with his 20" rifle. Got it running right by swapping out the m16 bc with an ar 15 one.

Your rifles may just not like the weight.
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Old 08-14-2018, 1:52 PM
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joe bob outfitters make their own bcg?
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Old 08-14-2018, 1:53 PM
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Quote:
Originally Posted by BigBamBoo View Post
Leaking gas key, wore out gas rings, not enough lube on the BCG, blocked gas key, etc.

One thing I have found is the one piece gas ring has been a problem for myself and one other person I know.
Switched to the old three ring gas rings and issue went away.

If the rifle works as it should, then the new BCG is suspect.

.
This sums it up pretty well
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Old 08-14-2018, 3:13 PM
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If you tuned your AR's adjustable gas block to run with semi-auto bolt carriers and then switch to a full auto bolt carrier, you may not be running enough gas to cycle the full auto bolt carrier fully. Do you know which carrier you're running? Are you using adjustable gas blocks?
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Old 08-14-2018, 7:35 PM
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Quote:
Originally Posted by k1dude View Post
If you tuned your AR's adjustable gas block to run with semi-auto bolt carriers and then switch to a full auto bolt carrier, you may not be running enough gas to cycle the full auto bolt carrier fully. Do you know which carrier you're running? Are you using adjustable gas blocks?
I'm running a 16" BA Hanson series Wylde barrel which comes with its own gas block. Like I was mentioning earlier, it ran flawlessly and locks back on the bcm bcg.
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Old 08-14-2018, 7:36 PM
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Quote:
Originally Posted by kenl View Post
Different bc types (ar15 vs m16)? A freind had a simular problem with his 20" rifle. Got it running right by swapping out the m16 bc with an ar 15 one.

Your rifles may just not like the weight.
Could it be a lug problem?
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Old 08-14-2018, 7:52 PM
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Could also be that it’s new and a little stiff. Oil it good and try it again.
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Old 08-14-2018, 7:53 PM
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Make sure the gas rings are not lined up on the bolt. Make sure the gas key is tight and not leaking. Make sure the cam pin is not catching/dragging inside the upper.
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Old 08-14-2018, 8:29 PM
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I just had this happen on my aero m5 rifle. Fires and cycles no problem as it always has, but sometimes it won't lock back and sometimes it will. Haven't made any changes to the rifle, locked back fine before. I'll lube it up more and see if that fixes it.
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Old 08-15-2018, 4:38 AM
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Could be a mag problem. What magazines have you tried in it so far?
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Old 08-15-2018, 5:38 AM
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Quote:
Originally Posted by kAnJii View Post
Could it be a lug problem?
typically not on new BCG's but I had a bolt where the lugs wore down and wouldn't hold anymore.

Try switching bolts with the BCM and rule that out.

also try your best to hold the rifle firmly. If you're loosey goosey you can have issues with cycling.
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Old 08-15-2018, 8:09 AM
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Quote:
Originally Posted by The War Wagon View Post
Could be a mag problem. What magazines have you tried in it so far?
Pmag, Troy, and compmag. Worked fine on bcm bcg.
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  #15  
Old 08-15-2018, 12:32 PM
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There are a lot of possibilities, one thing to check for is to see if you have a rifle buffer inside a carbine buffer tube. Semi bolt vs FA Bolt & running a heavier carbine or rifle buffer.

check under the bolt catch and make sure it is clean and debris free, inspect the tooth on the bolt catch and magazine follower where the tooth rides after last shot as well as the contact point on top of the bolt catch and bolt carrier.

Try another mag, maybe the internal spring is weak and not lifting it properly?
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