Mesa Tactical Semi Auto Truckee Forend Mossberg Model 940 and Mossberg Model 990 AfterShock 12 Gauge M-LOK 10.5 in Black. All Truckee forends have industry standard M-LOK slots that run along both sides and the bottom of the forend. M-LOK slots provide an easy way to mount weapon lights slings grips and other accessories to your gun. Specifications for Mesa Tactical Semi Auto Truckee Forend: Manufacturer: Mesa Tactical Color: Black Fabric/Material: Aluminum Gun Rail: M-LOK Weight: 0.5 lb Mount Type: M-LOK Gauge: 12 Gun Type: Shotgun Features of Mesa Tactical Semi Auto Truckee Forend Machined from a single piece of aluminum and uses high temperature glass-filled nylon end caps for durability. Industry standard M-LOK slots make attaching accessories like lights slings and grips easy. No small screws that could fall out and be lost. No tools required for installation or removal. Lifetime warranty Package Contents: Mesa Tactical Semi Auto Truckee Forend Mesa Tactical 91280: Semi Auto Truckee Forend Mossberg Model 940 and Mossberg Model 990 AfterShock 12 Gauge M-LOK 10.5 in Black