Quote:
The M16 (military full auto) rifles use a firing pin that has a slightly thicker collar (rim) around the rear of the firing pin than some commercial models. Supposedly better able to withstand the impacts involved when it comes to a lot of FA fire.
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Not true. The smaller firing pin collar on SOME of the civilian ARs is designed to hook the hammer notch (on the Type II style hammer) and stop the gun from runnaway firing should the disconnector fail.