Rugged Suppressors M2 Brake 1/2in-28 Tpi Threads Dual Taper Lockin. 5 oz and 1.3 the M2 Brake is one of the lightest and shortest muzzle brakes on the market. The M2 Brake features our Dual Taper Locking System and is compatible with our Radiant762 Surge762 Razor762 and Micro30. Specifications for Rugged Suppressors Dual Taper Locking 1/2-28 M2 Brake: Manufacturer: Rugged Suppressors Threads per Inch: 1/2x28 Length: 1-Mar in Weight: 1.5 oz Package Contents: Rugged Suppressors Dual Taper Locking 1/2-28 M2 Brake Rugged Suppressors MB014: M2 Brake 1/2in-28 Tpi Threads Dual Taper Lockin