Pretty common.
C4
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Correct. However, I don't think Lawmens will be doing rail installs any longer. I've been told that their gunsmith is no longer there. If its a KAC complete upper, call KAC. If not, I'd contact Neil at Gun Gallery. I'd recommend Grant too, but I don't think he has the time these days. ;-)
If you're near Northern VA I own the KAC alignment block and URX wrenches as well. I own two URX II rails and two URX III rails myself.
I have installed many of them. You basically have to red loctite the barrel nut onto the receiver. I think where people make an error is not FULLY degreasing the receiver and the nut OR shooting the gun too soon (not letting the loctite dry).
IMHO, this rail is much more likely to come loose than most other rail on the market. So when getting one installed, I would suggest the factory OR an armorer that will fix it if/when it comes loose.
C4
Thanks for all the responses.
It's a BCM built 11.5" upper receiver that I bought directly from BCM. I installed a BattleComp on it last year, but had to remove it and have it replaced. I re-installed the replacement BC 2.0 with a crush washer, and timed it per the instructions I found in a thread on here.
I had no idea it was dangerous to shoot. I just figured the rail needed to get torqued back down. Luckily I haven't had time to go to the range since I noticed it. I've only put three mags through it since I installed the BC 2.0.
Will BCM repair it, or should it go to a third party?