Trouble with my Colt AR

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Trouble with my Colt AR

Postby Pat on Fri Nov 17, 2017 10:20 pm

I have a very nice Colt AR. After A mag goes empty, the bolt stays towards the rear and I have a Dickens of a time getting it to slide forward again. It remains locked to the rear, and I can’t even open the rear.

Any thoughts about wat is retaining it towards the rear?
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Re: Trouble with my Colt AR

Postby usnret on Fri Nov 17, 2017 11:34 pm

Hit your bolt release and it will go forward.
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Re: Trouble with my Colt AR

Postby Pat on Sat Nov 18, 2017 12:24 am

No joy. The bolt is locked too far back.
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Re: Trouble with my Colt AR

Postby Rip Van Winkle on Sat Nov 18, 2017 8:03 am

If the bolt is locked back further than the bolt release, there's something broken, or there's a piece of debris lodged in it.

Try undoing both front and rear takedown pins, and slide the upper forward and up. Try to see what's binding the bolt.

If that doesn't work, you'll need to remove the stock and unscrew the buffer tube.

You might need a gunsmith.

Good luck.
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Re: Trouble with my Colt AR

Postby Scratch on Sat Nov 18, 2017 9:07 am

Does it cycle by hand easily? You should be able to see where it's binding. Maybe something is in the receiver extension tube...
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Re: Trouble with my Colt AR

Postby usnret on Sat Nov 18, 2017 1:15 pm

It almost sounds like the bolt is up against the hammer. And it sounds like the hammer is not in the cocked position.
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Re: Trouble with my Colt AR

Postby Uffdaphil on Sat Nov 18, 2017 1:29 pm

I don’t get why it would only occur after the last round in mag. Unless it has only happened once and a coincidence that debris lodged then.

I had a BCG get stuck in the tube, but it was pilot error. I had gone to change buffers and got distracted, forgetting to put in the new spring/buffer. Just lightly banged the muzzle onto the carpet and she came loose.
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Re: Trouble with my Colt AR

Postby Pat on Sat Nov 18, 2017 4:08 pm

Uffdaphil wrote:I don’t get why it would only occur after the last round in mag. Unless it has only happened once and a coincidence that debris lodged then.

I had a BCG get stuck in the tube, but it was pilot error. I had gone to change buffers and got distracted, forgetting to put in the new spring/buffer. Just lightly banged the muzzle onto the carpet and she came loose.


That works with my rifle. A couple of good bangs and the bolt slides forward.
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Re: Trouble with my Colt AR

Postby Pat on Sat Nov 18, 2017 4:08 pm

Uffdaphil wrote:I don’t get why it would only occur after the last round in mag. Unless it has only happened once and a coincidence that debris lodged then.

I had a BCG get stuck in the tube, but it was pilot error. I had gone to change buffers and got distracted, forgetting to put in the new spring/buffer. Just lightly banged the muzzle onto the carpet and she came loose.


That works with my rifle. A couple of good bangs and the bolt slides forward.
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Re: Trouble with my Colt AR

Postby UnaStamus on Tue Nov 28, 2017 1:07 am

Is it lubed well?
Also, open it up and inspect for a blown primer or other debris.
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Trouble with my Colt AR

Postby george on Wed Nov 29, 2017 9:00 am

Have you found your problem yet ? Have you tried the complete upper on a different lower, I'm thinking that the buffer tube or buffer spring detent but a different lower test would eliminate half of the guessing.

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