YHM NIELSEN PISTON M16X1RH YHM's Nielsen Pistons are compatible with YHM's booster housing YHM-2055 as well as many popular pistol suppressors. They are constructed from heat treated 17-4 stainless steel for maximum durability and corrosion resistance. They feature 10 adjustment points to zero any impact shift. Available in a variety of thread patterns to fit most firearms. Weight: 1.40 oz. Not compatible with Sidewinder suppressors