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. - The YHM-3135 is designed to completely cover the YHM-3302's mounts. It will also work with the shorter mounts YHM-3102's YHM-4302's & YHM-5M2-QD. - Will not fit YHM-3702's YHM-3802'S YHM-9923's & YHM-9853's - Specifications - Material 4140 Chrome Moly steel - Length: 2.69 - Weight: 5.4oz. - Finish: Melonite QPQ - Made in the USA.