Browning Competition Recoil Hawg Stainless Steel. 30 caliber or smaller with a 5/8''-24 TPI or 1/2''-28 TPI threaded muzzle (Barrel shoulder must be at least .700'' to install). Specifications for Browning Competition Recoil Hawg: Manufacturer: Browning Projectile Caliber: .30 Caliber Caliber: 7.62x51mm NATO Fabric/Material: Steel Threads per Inch: 5/8x24 1/2x28 Gun Make: Browning Length: 2.75 in Weight: 4.8 oz Features of Browning Competition Recoil Hawg Tunable muzzle rise reduction with top ports Package Contents: Browning Competition Recoil Hawg Browning 1293090: Competition Recoil Hawg Stainless Steel