What do you use to build your upper?

[bob4432]

I use a clamshell, the delta eng series I think? anyway, with BCM uppers, heat the upper in the oven to 175 for 15 min and place the barrel in freezer, watch out for condensation (I didn't see any but some folks have), then they slip together nicely. Everything else can be done in the clam in the vice. use counter-force to prevent over torqueing. I've built probably 10 uppers in the past few years, no problems at all. For any muzzle devices use jam nuts and locktite so you don't have to clock them.

eta: o and some anti-seize on a few barrel nut threads.

Thanks for the suggestion, sounds good. Out of curiosity, since I eat out of this oven, the BCM uppers have, I believe teflon on the inside - maybe not teflon but there is a coating on the inside of the upper in addition to the anodization - you know of any issue of any type of off-gassing (not sure if that is the correct term, but I think you know what I am talking about).

Thanks.