UTG Pro AR15 Stubby Muzzle Brake .223/5.56 1/2inX28 1.75in Length Black. Features a 1.75" Length 1/2"X28 UNEF Threads and Includes Crush Washer Specifications for UTG Pro AR15 Stubby Muzzle Brake .223/5.56: Manufacturer: UTG Pro Color: Black Finish: Matte Fabric/Material: Steel Gun Make: AR Platform Gun Model: AR-15 Length: 1.75 in Weight: 2 oz Country of Origin: USA Package Contents: UTG Pro AR15 Stubby Muzzle Brake .223/5.56 What firearm models does the manufacturer say UTG Pro AR15 Stubby Muzzle Brake .223/5.56 is compatible with? The manufacturer says that UTG Pro AR15 Stubby Muzzle Brake .223/5.56 is compatible with AR-15UTG Pro TLUMD01: UTG Pro AR15 Stubby Muzzle Brake .223/5.56 1/2 in x 28 Steel Black