Luth-AR 223/5.56 Compensator A1 Birdcage Black. Precision-engineered for .223/5.56mm rifles this muzzle device minimizes muzzle rise reduces flash signature and ensures rapid target acquisition. Crafted with high-quality materials it guarantees durability and reliability in the field. Specifications for Luth-AR 223/5.56 Compensator A1 Birdcage: Manufacturer: Luth-AR Threads per Inch: 1/2x28 Color: Black Caliber: 5.56mm Package Contents: Luth-AR 223/5.56 Compensator A1 Birdcage Luth-AR BL-06-A1: 223/5.56 Compensator A1 Birdcage Black