AR issue?

[quackadikt]

Pulled my AR out and ran 15-20 rounds through it a couple weeks ago. When I was done, I noticed the last round that chambered had a light primer mark on it from when it was fed. I’m mostly green when it comes to ARs...what should I be looking at to fix that problem?

If it matters, this same gun went from shooting quarters at 50 yards to shooting softballs at best just randomly last year.


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[Artos]

light primer strikes are normal & why a lot of people prefer to use a magnum primer (thicker cup) when reloading...not sure what your accuracy problems are unless you changed ammo / bullet weights??

[quackadikt]

Thanks for the info.

The ammo was factory reloads, but were supposedly the same bullets. I guess the powder or something could have changed, but I didn’t think it would make that big of a difference.


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[TacticalCowboy]

The AR has a floating firing pin. When the bolt closes the firing pin can move forward a bit and lightly ding the primer.

[ahlongslide]

The AR has a floating firing pin. When the bolt closes the firing pin can move forward a bit and lightly ding the primer.

This.
It’s normal

[quackadikt]

Bueno. Thanks everyone.


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[Mike D]

Pulled my AR out and ran 15-20 rounds through it a couple weeks ago. When I was done, I noticed the last round that chambered had a light primer mark on it from when it was fed. I’m mostly green when it comes to ARs...what should I be looking at to fix that problem?

If it matters, this same gun went from shooting quarters at 50 yards to shooting softballs at best just randomly last year.


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If I’m understanding you correctly, you had an unfired round that you chambered and it had a slight firing pin mark in it?

If so that is normal. The firing pin floats in the bolt and when dropping the bolt catch the firing pin moves forward and makes a little dent.




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[RifleBowPistol]

Like people have already posted, the firing pin is free floating, as the bolt slams shut, the energy of the firing pin causes it to hit the primer, it is possible for the firing pin to hit the primer hard enough to cause a slam fire, but very seldom. Thicker primers, such as Remington primers are one potential cure, you can also use a titanium firing pin, it has less weight so less energy, not very likely to cause a slam fire. It also cuts down the lock time, which is the time from when the sear releases the hammer till the firing pin hits the primer. Cutting down the lock time can increase accuracy some, but it's minor.

On the accuracy problem, that could be the ammo you are using, if you switched ammo, possibly. It could be the scope base or rings are loose, it could also be the barrel is fitting loosely in the upper receiver and or the barrel nut is not as tight as it should be. Could also be a scope. I am assuming you are using a scope.