[meketrefe]

With a few exceptions anything Advanced Armament, Surefire, AICS pre-set brakes and barrel, double threaded, etc.. or anything for that matter that might be consider constructive possession you want to stay away from it.
Another thing that EFIN "compensator" is not a good idea in the first place. Cool but inefficient. Tested that one on a dynamometer along with dozens of others. Very hard to clean after being pinned too. Sorry NY.

 

[meketrefe]

i have one of these in SS may be selling it for around $50

Those are not an issue and a lot more efficient that is for sure.