< 1/2 MOA 6.5 Grendel Barrel?

[bamban]

In lots of forum experience, bam uppers are tight and need to heat them up. As to bolts, the standard bolt face depth is 0.136, I think the 556 bolts are 0.125. So chambers will have to handle the one or the other. Bft’s bolts are the std depth. So you want to make sure you stay with those dimensions. A 0.125 bolt face depth and chamber will work but I’d think you want to go with the 0.136 depth.

The M16 GI bolts I opened up are cut to 0.136 depth. I modified 2 to have a spare. I will buy that one suggested here and chamber another barrel. I have a 28 inch 6.5x284 that I used for 1000 yard matches that I can harvest a good 20 inch in the middle from it to turn into an AR barrel.