Melonite AR-15 Barrel Extension Torque

[NoClassic]

I bought a 300 blackout upper a while back and switched out the muzzle device to a 51T mount. One of the brownells action rods was used to hold the barrel during install.

I just came across a thread about the melonite barrels moving in the extension if not clamped in a V block while installing a muzzle device.

Is there anything obvious other than gas tube alignment that would indicate there has been movement? Will a set of .556 head space gauges work to check a 300 blackout chamber?

[CJ]

no the headspace gauges wont work. If the barrel extension is moving, sounds like it isn't torqued properly.

[NoClassic]

They torqued the extension before the coating process which apparently causes the problem.

The company offered to send an RMA and check it, but I may just end up buying the gauges.

[svauto-erotic855]

I have the 300blk gauges if you need to borrow them.

[NoClassic]

Thanks for he offer but I think its fine. I pulled the barrel and nothing looked strange or felt loose. I also put maybe 200 rounds through it a couple weeks ago without issue.