This is a replica of Yankee Hill Machine's Phantom QD muzzle device, extremely close to the original except from the outside thread, and this is just so that it's compatible with my Turbo T2 suppressor replica. (Here: https://www.printables.com/model/1171245-yhm-turbo-t2-airsoft-replica-qd-version )
Threaded to 14mm CCW so it'll fit most airsoft replicas.
The author marked this model as their own original creation.