They are safe as there isn't much that can go wrong. Witt Machine Co. machines them to tight tolerances but you should put the Loctite on as they say.
I took mine off a couple months after I had installed it. Not necessary as you can clean it with it on the rifle. So I took it off and cleaned up all the dried Loctite on the barrel and cleaned/soaked the unit in Sea Foam (great at removing carbon ring from your barrel also) and when I re-installed it I did not put Loctite on.
A week later at my next range session, I had two or three rifles in addition to the .300 that I was working with, so I only shot the .300 twice at 100yds to verify zero. I returned home hours later and discovered the brake missing. I returned to the spot and started walking from where I had shot it and 25-30yds beyond lay the brake. All I can figure is that it blew off with the second shot because I didn't notice an increase in velocity and both shots were touching. Live and learn. I keep Loctite on'er now.
JohnnyK.