I spoke to the gent at nss but I havent actually bought it yet. I'm still paranoid I'll pick the one that doesnt fit in the stock. Thee diagrams only give one measurement at the muzzle 0.729. My current barrel is .755 near the thread protector and 1.040 near the barrel nut. I also want to have the tools I need in order.

I will probably look into that Norton round hone. Might be the best compromise.