PRIMARY WEAPONS FSC556 MOD 2 .22 CALIBER COMPENSATOR FOR AR-15 In addition to offering superior compensation characteristics, PWS FSC Series provides enough flash suppression to keep the flash out of your optics and line of sight. Designed for both competitive and tactical use, the FSC Series allows for superior muzzle stabilization and aids the shooter in faster follow-up shots and accuracy. The unique port design of the FSC Series yields muzzle control that meets or exceeds the performance of the best muzzle brakes on the market without the teeth-rattling overpressure indicative of other brakes and compensators. The FSC556 model is a suppressor-compatible mount for select Mfg: Primary Weapons