Rugged Suppressors Muzzle Device, Flash Hider, For M249, 9/16x24 LH Thread Pitch, Matte Finish, Black MD001 Take advantage of Rugged's belt fed ratings with your M249. The M249 - 9/16x24LH Muzzle Device features a Dual Taper Locking System and is compatible with Rugged's Alaskan360" Surge762" Razor762 and Micro30.