AI small vs large firing pin..lots of questions, tolerances and specs plus more...

[Huskydriver]

I think my serial number starts with 13 AT 19XXX not sure which year that is.

Then you might have issues as yours is probably a large. You can easily tell the diff between the firing pin tips.

You can try to run the 6br and see if you get cratering. If you do, you can either send your bolt to lri to get bushed or just order a new sfp bolt assembly and firing pin

 

[jbuck88]

I think my serial number starts with 13 AT 19XXX not sure which year that is.

First 2 numbers are the year. So "13 AT . . ." would be 2013.

 

[brianf]

So a quick questio. I am planing to shoot 6br in my AT. Am I going to need to change to the small firing pin to do this or is the large pin going to work?

I shoot factory 6br ammo with a large pin and haven’t had a problem

 

[cro789]

Thanks I will try it first and then if I need to change it I will.

 

[Haney]

So a quick questio. I am planing to shoot 6br in my AT. Am I going to need to change to the small firing pin to do this or is the large pin going to work?

I have two 6 BRs with factory Remington 700 actions . The primers crater just like like they did when they were shooting . 308 winchester loads . No worries . I use CCI 450s mostly , Remington 7 1/2s held up fine also .