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'sModel: Blast DeflectorMaterial: 4140 Chromoly Steel