Black Aces Tactical Forend Spike - Mossberg Series Description This tactical spike comes from Black Aces Tactical and replaces that boring old tube knob look with a tactical spike. Great way to finish off that custom Mossberg look. Spike is made from the same anodized aluminum the Black Aces Tactical rail is made from. This spike is 1" long and comes with the needed set screw to attach to the magcap. Comes with spike and set screw, magcap not included. Requires the removal of the sling point on the forend knob. Fits: Mossberg 500, 590, Maverick 88, & Shockwave. This fits 12/20/.410 gauge shotguns. This may fit other Mossberg shotguns that use the same magazine cap as the listed models. SET SCREW SIZE: 10-32 x 1/2" - The threaded hole in the magcap must be 10-32. NOTE: Image shown is with an 18" barrel - Different length barrels will make it so more or less of the spike will be sticking out beyond the end of the barrel.