Offcenter primer strikes?

[BCP]

An AR upper I assembled for a friend is striking offcenter on the primers. I took it apart, put it all back together (thought maybe I didn't torque the barrel properly the first time) and it's still doing it. Firing pin hole seems to be centered in the bolt, chamber isn't out of spec (no abnormal case growth).

Any thoughts as to what is causing this? It goes bang every time and he is happy with it but I'm a bit annoyed because I can't find a culprit.

 

[Captain Moroni]

Re: Offcenter primer strikes?

If its just a small amount off center its normal, dont worry about it.

 

[BCP]

Re: Offcenter primer strikes?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Captain Moroni</div><div class="ubbcode-body">If its just a small amount off center its normal, dont worry about it. </div></div>

I'll see if I can get some pics up in a minute. It's about half the thickness of the firing pin, maybe a bit more.

 

[BCP]

Re: Offcenter primer strikes?

Measuring them it looks like it's off by a hundredth of an inch & it's consistent so I don't think it's that the firing pin is rattling around inside the bolt. I'm probably worrying over nothing here. BTW it is 308 caliber.

 

[Longshot38]

Re: Offcenter primer strikes?

How does the rifle shoot now? Does it fire dependably? If it shoots well and fires without incident what does it matter? I get off center strikes on a regular basis but as long as the above mentioned criteria are met then I don't concern myself with things of little to no consequence.

 

[BCP]

Re: Offcenter primer strikes?

It seems fine, I'll know for sure this weekend (going to a better range with some FGMM all I had last time was mixed brass plinker loads).