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Actually that's a very good question Jamie. Well the brake works fine on my VZ-58. I have the Marstar brake and the Kasat break. I see no difference between them but I've noticed a 30%-35% reduction in barrel climb when you fire 3-5 shots in succession. I wouldnt know how effective it will be on an M-305 frining 7.62x51 with a longer barrel but I guess you'll tell us . As far as the thread pitch, it appears to be metric and screws in clockwise lol. I dont know more sorry