GRIFFIN DUAL-LOK OTB 2 PORT BRAKE 7.62 Our OTB (over the barrel) muzzle devices interface with our OTB Silencers, The RSTA and SPR. This two-piece, welded design will be sure to impress your friends. Automated welds provide aesthetically pleasing and rugged design and functional characteristics. The Paladin R muzzle brake is integrated into this modern twist on a Griffin classic. "R" implies the reverse braking motion that kills recoil and keeps your shots on target. Enjoy. Length: 4.15" Material: 17-4 PH SS Weight: 4.2 ounces Attachment: 1/2x28 or 5/8x24 threads Finish: Black Oxide Free of wear prone geometry 17-4 PH stainless to withstand hard use Lustrous black oxide finish Griffin Laser Logo Marked Industry Standard thread pitches Shim set Included Compatible with SPR and RSTA Silencers