Bolt Won't Stay Back

[DarthVader]

Shit - could be a short tube, but cutting the screw down worked. I replaced the damn mag release with 2 others, swapped uppers, etc. Finally occurred to me that it had to be somewhere in the extension just by process of elimination. Sounds like this could very well be the OP's problem as well.

I'd bet he's using a regular carbine receiver extension. In that case, there's no screw to obstruct the travel distance, only the back end of the tube. My money is still on a lower or parts kit issue though.

 

[Righter13]

Had not thought of that. A short buffer tube could cause the same issue.

Or screwed in too far (making it seem short)

 

[DarthVader]

Or screwed in too far (making it seem short)

I thought about that. But you'd run into other issues that should make that obvious. Like the buffer detent binding or the upper wouldn't close onto the lower.

 

[Righter13]

I thought about that. But you'd run into other issues that should make that obvious. Like the buffer detent binding or the upper wouldn't close onto the lower.

Unless he hulk smashed it shut lol.

 

[DarthVader]

Unless he hulk smashed it shut lol.

Well, how big a boy is ol' Strider?

 

[Strider12]

No hulk smash. Regular carbine tube.

 

[Strider12]

Actually it's a pistol buffer tube.

 

[Cudruln]

Actually it's a pistol buffer tube.

So is that reasoning behind it not working properly?

 

[Wallace]

Have you looked inside the receiver to see if you can better identify what is going on? This picture is what I am referring too. Note: the mag follower pushing the catch up for good bolt blockage. May help to post a pic like this. Will help identify out of spec problems. If you have a functioning AR bolt catch, would be helpful to compare just to rule out what you can before going and swapping out a bunch of stuff.

 

[Strider12]

Have you looked inside the receiver to see if you can better identify what is going on? This picture is what I am referring too. Note: the mag follower pushing the catch up for good bolt blockage. May help to post a pic like this. Will help identify out of spec problems. If you have a functioning AR bolt catch, would be helpful to compare just to rule out what you can before going and swapping out a bunch of stuff.

View attachment 17037

Thanks. They have a new bolt catch and hardware coming. When I get those installed and try it again if there are any issues I'll come back to this.