ABC RIFLE COMPANY AR-15 Pentagon Style Thread Recoil Compensating Steel Muzzle Brake .223 Remington/5.56x45mm NATO 1/2x28 Nitride Black. Its slanted multi-port design vents gases effectively to the sides helping maintain target acquisition during rapid fire. Featuring precision 1/2x28in threading it fits most standard AR-15 barrels chambered in 5.56 NATO or .223 Remington. Side wrench flats ensure easy installation and secure torque. Ideal for tactical setups or competition builds this brake delivers performance and durability. Specifications for ABC RIFLE COMPANY AR-15 Pentagon Style Thread Recoil Compensating Steel Muzzle Device: Manufacturer: ABC RIFLE COMPANY Color: Black Caliber: 5.56x45mm NATO .223 Remington Finish: Nitride Fabric/Material: 4140 Steel Threads per Inch: 1/2x28 Gun Make: AR Platform Gun Model: AR-15 Outer Diameter: 0.87 in Length: 2.5 in Weight: 4 oz Gun Type: Rifle Package Contents: ABC RIFLE COMPANY AR-15 Pentagon Style Thread Recoil Compensating Steel Muzzle Device What firearm models does the manufacturer say ABC RIFLE COMPANY AR-15 Pentagon Style Thread Recoil Compensating Steel Muzzle Device is compatible with? The manufacturer says that ABC RIFLE COMPANY AR-15 Pentagon Style Thread Recoil Compensating Steel Muzzle Device is compatible with AR-15ABC RIFLE COMPANY MB15-PG: AR-15 Pentagon Style Thread Recoil Compensating Steel Muzzle Brake .223 Remington/5.56x45mm NATO 1/2x28 Nitride Black