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Posted: 12/4/2005 3:22:32 AM EDT
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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. |
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check everything else first before fiddling with the gas port, you can't easily make them smaller, but that port ID is small for a 11.5" that size is used on 16", the bolt locking back means there is enough gas but it may turn marginal with heat and fouling. check your feed ramps and check the gas system for leaks, start with the carrier key screws and the OD of the breech end of the gas tube v. the ID of the key. have you got it hot THEN short stroke tested it? what ammo are you using? |
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. |
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