NEMO Arms Builder Series TC-1 Muzzle Brake .30 Carbine/7.62mm 5/8x24 Oxide Black. Ports are biased to force gasses upward to help reduce muzzle rise. Specifications for NEMO Arms Builder Series TC-1 Muzzle Brake: Manufacturer: NEMO Arms Color: Black Caliber: .30 Carbine 7.62x39mm Finish: Bead Blasted w/ Black Oxide Fabric/Material: 4140 Steel Threads per Inch: 5/8x24 Gun Make: AR Platform Gun Model: AR-10 Outer Diameter: 0.975 in Length: 2.75 in Weight: 3.29 oz Gun Type: Rifle Package Contents: NEMO Arms Builder Series TC-1 Muzzle Brake What firearm models does the manufacturer say NEMO Arms Builder Series TC-1 Muzzle Brake is compatible with? The manufacturer suggests that NEMO Arms Builder Series TC-1 Muzzle Brake is compatible with AR-10NEMO Arms NBP-30C-MB-TCS: Builder Series TC-1 Muzzle Brake .30 Carbine/7.62mm 5/8x24 Oxide Black