Hard lessons learned

[jb2012]

Was putting an A2 flash hider on a barrel just now and either my barrel (ballistic advantage so I don’t think so) or the A2 was out of spec and when at the proper torque was upside down. I have a tendency to strong arm things to make them work and that was a bad decision. I now have a busted ballistic advantage barrel and aero upper receiver. some lessons you learn the hard way.

[RogueUSMC]

I have yet to find one that was indexed correctly at the recommended torque. I have always had to use shims. Most of the ones I have used are Claymores from Troy...indexing is just cosmetic with those...lol

[CleverNickname]

A muzzle device that requires timing needs a crush washer or shims. Everything might line up without them, but it's extremely probable that they won't. If they don't, then it doesn't mean that something's out of spec.

[Scott B.]

Wait, both barrel and upper receiver are toast? I'm impressed. Pictures?

Bending the upper out of whack I can see. Did you shear off the extension pin?