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Any tips on removing the A2 flash hider safely and without damaging the barrel or the upper, and installing the BABC, With just a regular vice in absence of any sort of dedicated AR vice? Rifle is LWRC REPR 16
I would maybe warm it up a little, with a heat gun, in case it has locktite on it. Unless a gorilla put it on, you really shouldn't need a vise to remove it.
turn your AR on its upper rail and straddle it locking it between your legs. Put a lock wrench on the birdcage flash hider and give it a quick few taps with a hammer. It'll come off no problem.
I used a heat gun to loosen the thread locker/loctite the A2 flash hider on my AR and then used a wrench to take it off. I did this with the rifle (upper and lower assembled) in a Brownells lower receiver vice block. http://www.brownells.com/.aspx/pid=25011/avs|Manufacturer_1=BROWNELLS/Product/AR-15-M16-LOWER-RECEIVER-VISE-BLOCK
Got the BABC installed. Turns out we have a pipe vice on the work bench in the basement, perfect for a barrel. So I wrapped the barrel forward of the gas block with a leather strip of an old tattered belt no one was using and clamped the sucker down. The A2 FH came right off with little pressure.
When I screwed the BABC on, it was "timed" perfectly in the sense that the solid part was straight down, but it was loose, so I had to crank one full revolution to get the solid part at the 6:00 again, this time tight like a bitch.
It's pretty much squared perfect, if not off by a slight, and I mean SLIGHT, degree. No signs of barrel damage via over-torquing whatsoever. Here's a picture: