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Old October 14, 2013, 02:38 PM   #6
Bart B.
Senior Member
 
Join Date: February 15, 2009
Posts: 4,378
Both M1 and M14/M1A rifles can fire out of battery even though the hammer is still held back by the sear. Extra thin/soft primer cups will fire the round by the inertia of the firing pin before the bolt's closed full into battery.

http://thefiringline.com/forums/showthread.php?t=532970

Search this forum for "slamfire M1A" and several links to discussions will show up. Member "Slamfire" has a lot of good info on such things.
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Last edited by Bart B.; October 14, 2013 at 04:19 PM.
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