Primary Weapons Systems FSC556, Flash Hider/Compensator, 223 Remington, Black, Fits 1/2x28 3G2FSC12A-1F The patented FSC compensator was designed to be an effective compensator for shooters in all situations. Offering recoil reduction as a primary function" and flash suppression as a secondary function" the FSC is one of the most popular PWS compensators on the market. The unique port designs effectively keep flash out of optics and line of sight" while also reducing the distracting overpressure that is felt with many compensators.