Armaspec FMC-G17 Frame Mounted Compensator Black. Its innovative design and precisely positioned ports enhance gas dispersion resulting in improved firearm stability and superior control. Allows quicker target re-engagement by reducing the rising of the muzzle resulting from the recoil of the shot. Easy mounting on the frame no threaded barrel needed. Pat Pend. Specifications for Armaspec FMC-G17 Frame Mounted Compensator: Manufacturer: Armaspec Color: Black Finish: III Hard Coat Anodized Fabric/Material: 6061-T6 Aluminum Width: 3.5 in Features of Armaspec FMC-G17 Frame Mounted Compensator Coming Soon Package Contents: Armaspec FMC-G17 Frame Mounted Compensator Armaspec ARM4411-BLK: FMC-G17 Frame Mounted Compensator Black