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Posted: 12/4/2005 3:22:32 AM EDT
I have a carbine with a Fulton Armory 11.5 barrel that was cut down from a 16 barrel.

It fires well until it begins to get hot. When it gets hot, it fails to feed and jams.

After clearing the weapon, and checking the round that failed to feed, I see that the bullet is inside the brass casing.

The bolt locks open after firing the weapon with a magazine and one round.

What seems to be the problem?

Thanks.
Link Posted: 12/4/2005 5:38:21 PM EDT
Link Posted: 12/14/2005 2:35:29 PM EDT
Gas port size is .078.

Should it be larger?

Thanks.
Link Posted: 12/14/2005 3:27:04 PM EDT
Link Posted: 12/14/2005 3:37:31 PM EDT

Originally Posted By GiveMeStatehood:
After clearing the weapon, and checking the round that failed to feed, I see that the bullet is inside the brass casing.



Are you saying that the bullet has been pushed back into the case beyond it's normal seating depth?
Link Posted: 12/14/2005 4:23:02 PM EDT

Originally Posted By Triple_D:

Are you saying that the bullet has been pushed back into the case beyond it's normal seating depth?



Yes.
Link Posted: 12/14/2005 4:29:18 PM EDT

Originally Posted By Tweak:

have you got it hot THEN short stroke tested it?

what ammo are you using?



Yes.

PMC, Sellier & Bellot and blue box Black Hills 75gr.
Link Posted: 12/14/2005 9:22:27 PM EDT
Link Posted: 12/18/2005 5:35:53 AM EDT

Originally Posted By Tweak:
are you holding the rifle as loosely as possible when you short stroke test it? try testing it one handed and see if it passes.



I did the test as told, with the weapon hot after firing about a hundred rounds in rapid fire.

With magazines with Magpul followers the bolt locks open.

With magazines with green followers the bolt doesn't opens.

I find that odd.

Thanks.

Link Posted: 12/18/2005 5:48:31 AM EDT
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