Quote Originally Posted by zloe View Post
What is protrusion supposed to be?
WITHOUT the nut I can get the gauge to mate with the new Bolt head.
Seems it is the old nut...
I have an axis barrel I could use the nut from, however the nut will not come off... I think it's the blueing salts. Barrel is off the receiver, but that nut will only come off about 3 full turns and seizes up something fierce. Bluing salts everywhere...
Penetrating oil (Kroil, etc.), stand barreled action on end, let soak down into the threads. Re-apply as needed, leave overnight.
If still no luck, apply some heat to the nut, try again. Part is cheap enough, you've got a match-grade barrel, a new (trued) nut would be my choice...