The B&T Official 3 LUG ADAPTER 1/2×28 MUZZLE ADAPTER BT-122506 is designed for multiple firearms like Heckler & Koch and B&T firearms in 9mm Luger caliber, specifically for PCCs and rifles. Made of stainless steel and steel, this black adapter features an adjustable design. The B&T brand guarantees high quality and reliability for this model, ensuring compatibility with 3 lug muzzle devices.