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Old 05-04-2010, 05:39   #1
commando57
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Join Date: Dec 2009
Posts: 26
Using upper for case gage.

In my Glock I pop out the barrel and drop a round in there, all is good. When I drop a round in the AR it drops right in and falls out with gravity. I just am not sure if the round is too long or not. In the asssembled gun I guess my question is that I do not know how to tell if the AR bolt is locked or not. On a bolt gun the bolt is down it is ready, but on the auto how can I be sure? Will it fire if it is not completely locked up? I just got a case gage (Lyman) and it will not accept many of my cases backwards that I have been shooting fine and suspect the gage, but I would like to use the actual chamber for a gage.
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Old 05-04-2010, 11:52   #2
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As long as the firing pin isn't broken in half the rifle will not FIRE out of battery.
If something is stuck to the bolt face then you could have a slam fire but not FIRE out of battery.
Take the carrier out and pull the bolt to the front, push the firing pin in from the rear and you can see it will not protrude through the face of the bolt. Stoner was a pretty smart fellow he designed it so the firing pin is pulled back out of the bolt on every cycle. The firing pin will only protrude if the bolt has been cammed into the lock position. On a semi it is best to size the cases (shoulder)back .004" for reliability, on a bolt gun neck sizing or.002 is fine.
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