Rugged Suppressors Muzzle Device, Flash Hider, For M240B, 25/32x24 Thread Pitch, Matte Finish, Black MD002 Take advantage of Rugged's belt fed ratings with your M240B. The M240B - 25/32x24 Muzzle Device features a Dual Taper Locking System and is compatible with their Alaskan360" Surge762" Razor762 and Micro30.