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9/22/2017 12:11:25 AM
Posted: 4/14/2002 5:38:35 PM EDT
Over time I've noticed that when I chamber a round in my AR15a2, then extract it (without firing), it creates a small dimple in the primer. Not enough to ignite the primer but large enough to easily see it.

Is this normal, and should I worry about it? I wouldn't want an accidental slamfire. Are there any types of commercial or surplus ammo that have sensitive primers that we should avoid due to this? Also, is the primer with that dimple any less stable than one without?

I might be worrying over nothing, but better safe than sorry.

Thanks all...
Link Posted: 4/14/2002 5:42:44 PM EDT
The dimple on the primer is relatively common given the free-floating AR15 firing pin. Military ammunition is typically loaded with primers having "thicker" primer cups----these are available from CCI for reloaders. I would tend to doubt that dimpled primers are any more sensitive or dangerous than non-dimpled ones.
Link Posted: 4/14/2002 8:17:14 PM EDT
Link Posted: 4/14/2002 8:55:25 PM EDT
Link Posted: 4/14/2002 10:24:17 PM EDT
I have personally experienced some "slam-fires" with handloaded 223 ammo using Winchester small rifle primers. I eliminated the problem with a titanium firing pin. So far so good.
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