Stern Defense SD CB9 MOD2 Muzzle Device Black 003-SD CB9 MOD2-D2-MA. S.A. Full auto tested to ensure that the compensator ports keep muzzle rise to a minimum. The twin chamber ports guarantee that every last bit of usable gas is utilized to kill recoil. Machined from US Mil-spec AISI 4140 steel and black nitride coated to provide a lifetime of abuse. . Note: Comes with crush washer. Specifications for Stern Defense SD CB9 MOD2 Muzzle Device: Manufacturer: Stern Defense Color: Black Finish: Black Nitride Gun Model: AR-15 Additional Features: Threaded .5-28 Features of Stern Defense SD CB9 MOD2 Muzzle Device Full auto tested US Mil-spec AISI 4140 steel. Sturdy construction. Black nitride coating 9MM Threaded .5-28" Package Contents: Stern Defense SD CB9 MOD2 Muzzle Device What firearm models does the manufacturer say Stern Defense SD CB9 MOD2 Muzzle Device is compatible with? The manufacturer suggests that Stern Defense SD CB9 MOD2 Muzzle Device is compatible with AR-15Stern Defense 003-SD CB9 MOD2-D2-M : SD CB9 MOD2 Muzzle Device Black 003-SD CB9 MOD2-D2-M Black