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Join Date: Oct 1999
Location: 3D, Luzerne County
Re: Light indent on primer ar-15 round
Any rifle with a free floating firing pin will leave a small mark on the primer when you cycle a round through the action.
I've reloaded and shot many, many thousands of rounds through my AR rifle and M1 Garand using regular CCI primers. #400's in the AR, #200's in the M1. As long as you ensure you don't have a high seated primer, there won't be an issue.