The PTS Syndicate Griffin Armament M4SDII Mock Suppressor gets reviewed by Hyperdouraku. This being a Mock Suppressor, is more of a Barrel Extension. This is compatible with all the PTS Griffin products such as the Muzzle Break, Flash Comp, Tactical Compensator, and Flash Suppressor. According to Yas, the QD design makes it easy to install on A2 and similar muzzle devices. He recommends as he likes the texture and fit.

Read the full review here (in Japanese).