yea several outfits, Global used to sell em, they are used on SBR Krinks in 7.62 all the time ya'd need to do some searching, the thread adapters are available all over the place, we only use the J-Tac and Phantom anymore as these are the most effective, the phantom for actual flash suppresion and the J-Tac for actual muzzle control......... the rest are less effective so..... we don't bother with them anymore
