The Tiger Rock Inc. MBR05-9-S AR-9/9X19 Muzzle Brake is engineered for precision and performance on your AR 9MM platform. Crafted from high-grade 4150 steel, it guarantees long-lasting durability complemented by a stylish stainless steel finish. This advanced design features a birdcage structure with five strategically placed ports, significantly minimizing recoil and muzzle rise. The 1/2"x36 thread pitch ensures a secure fit for effortless installation. Note that the fitted steel crush-washer is available separately. Solid 4150 steel construction Corrosion-resistant stainless steel Efficient birdcage design with 5 ports Standard 1/2"x36 thread pitch Compatible with AR 9MM firearms Elevate your shooting accuracy and control with this top-tier muzzle brake.