YHM designed this QD Blast Deflector to work with multiple YHM QD muzzle devices. The QD Blast Deflector locks on just like a YHM Suppressor. The Mechanism is fast positive and virtually impossible to disengage accidentally. - Specifications - Material 4140 Chrome Moly steel - Length: 2.19 - Weight: 4.7oz. - Finish: Melonite QPQ - Made in the USA.