My Barrel Suddenly Unthreaded

[jmoore]

...I won't tell you how to accurately torque up your barrel on a surface plate as it's already been covered in an earlier thread. But there are your four options

1) use a large selection of barrels
2) hammer a shoulder around the breeching up face of the barrel...

Too funny that, as I've been "knee deep" in M14 barreling jobs lately, and the second option not only works, but it's been often employed by Springfield Armory, Inc. to fit GI barrels to their receivers. As long as one doesn't rotate the barrel too far (requiring a bit of unscrewing) it works fine, and that's on a semi-auto. Done well, it's not unsightly either.

The stupid thing is that I've reused two barrels previously peened and then pulled for whatever reason and installed them on a receiver which tends to "unpeen" the shoulder as it's apparently longer up front than whatever those barrels were on previously.

Peening is a no cost option that may work great! If not, you can always fall back on the thick breeching up washer.

BTW, I use highly polished hammer faces when peening. With patience and the right technique it won't do more than shine up a blued or phosphated finish. Can't hardly tell it's been done.