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It's perfectly normal for an AR 15 to make a small dent, as the fireing pin floats.
The design does require you to keep the your bolt clean and clean primer pockets during reloading to prevent "Slam Fires" due to high primers.
Some reloaders stear clear of Federal primers when reloading for the AR as they are known to have softer than most cup material.
I noticed it when I bought my Ruger SR556 and then researched it on the internet. It sounds like it's not uncommon. I couldn't find a report of the firing pin actually hitting hard enough to fire the cartridge in an AR. But I have seen the results first hand of slam fire in an SKS ( I work in a hospital)....not pretty.
Nevertheless..... I installed a titanium firing pin ( it's lighter) and now it doesn't dent the primer and I feel better. Still want to point that baby in a safe direction ( just like all guns !! ).
PS: If I ever found a mod that allowed for a firing pin spring on an AR, I'd be all over it !! (Hint to clever machinists !)
Yeabut what? Good luck trying to get a large rifle primer into a small rifle primer pocket.Make sure that your ammo is using #41 primers and not small caliber rifle primers. The #41 primers have a heavier (Thicker) cup to prevent slam fires. #34 for 7.62 rounds...
that would be a change in the gun powder from a clean burning stick powder that the AR15 was designed around to a spherical powder with heavy calcium carbonate, the new powder also was a faster burn causing premature unlocking of the system leading to breakages, usually the bolt lugs.....after the rifle was proven, the rifle is a genius deign that went 80,000 flawless rounds in the provingCertainly there were some Vietnam vets that weren't impressed.
I wonder what all primers Nato/military/factory loads use? Guaranteed it's not "THE WHITE BOX CCI PRIMERS ONLY". fehIf you are reloading, USE THE WHITE BOX CCI PRIMERS ONLY. These are made for the military. DO Not use any other primers for AR style weapons. This will still happen with the CCI primers. It's just the way it is, the firing pin floats. One of the best,and easiest weapons to work on.