I got a new Bushy A2 upper(14.5 w/phantom FS) to put on my Pre-ban Oly Lower a few months ago.
After several hundred rounds the bolt carrier key came loose. I used blue loctite when I screwed it back on. After visiting my local Police Supply place I learned that the carrier key is supposed to be tightened and staked in place. Will the loctite do the job? Or should I have it re-staked by somebody. Upon inspection, it appears that an attempt was made to stake the key in place originally.....must just not have done a good enough job I guess.
BTW....I've put several thousand rounds through it since the loctite fix.....No problems....I ask because I just learned about the staking aspect of this and I want to keep my rifle running as well as possible.