Tiger Rock Zombie Slayer Muzzle Brake Jam Nut Incl. AR-10/LR-308 4in Black Small. It has an overall length of 4in and 6 razor sharp prongs each measuring 1.6in long. The 8 ports redirect pressure resulting in significantly less muzzle rise and overall felt recoil. Specifications for Tiger Rock Zombie Slayer Muzzle Brake: Manufacturer: Tiger Rock Color: Black Finish: Parkerized Fabric/Material: 4150 Steel Gun Make: AR Platform DPMS Gun Model: DPMS LR-308 AR-10 Features of Tiger Rock AR-15/47/9/300 Stripped Upper Receiver Zombie Slayer design with 8 ports DPMS Compatible Package Contents: Tiger Rock Zombie Slayer Muzzle Brake Jam Nut What firearm models does the manufacturer say Tiger Rock Zombie Slayer Muzzle Brake is compatible with? The manufacturer suggests that Tiger Rock Zombie Slayer Muzzle Brake is compatible with AR-10 DPMS LR-308Tiger Rock MBR35LONG: Zombie Slayer Muzzle Brake Jam Nut Incl. AR-10/LR-308 4in Black Small