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I have a Bushmaster 223 and I noticed that a couple of the unfired rounds I pulled from the chamber had marks on the primer like the firing pin hit the primer when the shell was loaded. Has anyone seen this before or know what could be causing this?
 

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It's normal for AR's. The floating firing pin will dimple the primer when the bolt goes into battery.

Always keep the muzzle pointed in a safe direction when loading (not just AR's, but any gun). :biggrin:
 

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IMO, that's common enough to be called normal for the AR platform. It's caused by the floating firing pin. I first saw it in the mid 70's when my grandpa bought the first AR I had ever seen, a Colt SP1. Every AR I've ever paid any mind to did it.

From the Colt AR15 owners manual.

Note1: On Colt 223 cal firearms, it is normal for a light firing pin indent to appear on cartridges which have been fed into the chamber, but not fired.
 

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There's a lot of semi-autos out there with floating pins-- mini 14's, SKS's, M1 carbines and Garands as well, I think. Generally the inertia of the bolt slamming home ain't enough to pop the cap, but things happen sometimes. If you remember rule # 1, it's all good.
 
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