Primary Weapons Systems FRC Flat 3-Port Compensator Features The Primary Weapons Systems FRC Flat 3-Port Compensator is a square shoulder pin-and-weld muzzle compensator threaded at 1/2x28 and specifically engineered to bring 13.8 barrel configurations to a non-NFA overall length when permanently attached while simultaneously serving as a suppressor host for the Rearden Atlas and Atlas XL mounting systems. Recoil reduction is the primary function with the 3-port design redirecting muzzle gases to flatten the shooting platform and reduce felt recoil through sustained fire while the port geometry keeps flash out of optics and the shooter s line of sight to maintain a clear unobstructed sight picture. When paired with a compatible Rearden Atlas or Atlas XL suppressor the FRC Flat 3-Port Compensator delivers a tight lockup that holds through hard shooting cycles without loosening or shifting under sustained fire. The 1/2x28 square shoulder pin-and-weld 3-port compensator measures 2.75 overall adding the precise length needed to bring a 13.8 barrel to a compliant overall rifle length in a single permanently attached muzzle device that requires no additional components for NFA compliance. A torque specification of 25-35 ft-lbs ensures proper installation engagement and the square shoulder design provides the stable indexing interface needed for consistent suppressor alignment with Atlas and Atlas XL adapters. Primary Weapons Systems engineered the FRC Flat 3-Port to give AR builders a single muzzle device that addresses the NFA compliance requirement and the suppressor host function simultaneously without compromise to either. Primary Weapons Systems FRC Flat 3-Port Compensator Specifications Manufacturer: Primary Weapons Systems Model: FRC Flat 3-Port Compensator Caliber: .223 Thread Pitch: 1/2x28 Shoulder: Square Type: 3-Port Compensator Length: 2.75 Mount Compatibility: Rearden Atlas Rearden Atlas XL Application: Pin and Weld for 13.8 Barrels Torque Spec: 25-35 ft-lbs