Yankee Hill Machine Phantom 5.56 Q.D. Muzzle Brake 1/2x28 TPI 5M2QD. 56 sound suppressor. Five port design has no downward facing port which helps eliminate dust signature when shooting in the prone position as well as acting as a compensator. Threaded 1/2x28. Specifications for Yankee Hill Machine Phantom 5.56 Q.D. Muzzle Brake 1/2x28 TPI YHM-5M2-QD: Manufacturer: Yankee Hill Machine Color: Black Caliber: 5.56x45mm NATO Threads per Inch: 1/2x28 Gun Model: AR-15 Condition: New The Yankee Hill Machine Phantom 5.56 Q.D. Muzzle Brake 1/2x28 TPI YHM-5M2-QD is a quality addition to the Yankee Hill Machine lineup. For more great deals on Muzzle Brakes & Compensators by Yankee Hill Machine please browse our Yankee Hill Machine Gun Parts page. What firearm models does the manufacturer say Yankee Hill Machine Phantom 5.56 Q.D. Muzzle Brake 1/2x28 TPI YHM-5M2-QD is compatible with? The manufacturer says that Yankee Hill Machine Phantom 5.56 Q.D. Muzzle Brake 1/2x28 TPI YHM-5M2-QD is compatible with AR-15