Primary Weapons Systems FRC Flat 3-Port Compensator Features The Primary Weapons Systems FRC Flat 3-Port Compensator is a square shoulder muzzle compensator threaded at 1/2x28 engineered for barrels with a square shoulder profile and purpose-built to serve as a suppressor host for the Rearden Atlas and Atlas XL mounting systems across the broadest caliber range from .22 to .375. 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 3-port compensator and suppressor host covers calibers from .22 to .375 extending compatibility to pistol-caliber carbines and smaller bore rifle platforms running square shoulder barrel profiles at the most common thread pitch. A torque specification of 35 ft-lbs ensures proper installation engagement and the square shoulder design provides the stable indexing interface needed for consistent suppressor alignment with Rearden Atlas and Atlas XL adapters. The 1/2x28 configuration complements the 5/8x24 version giving shooters a matched FRC Flat 3-Port Compensator option across the two most common rifle and carbine thread pitches in the Rearden Atlas ecosystem. Primary Weapons Systems FRC Flat 3-Port Compensator Specifications Manufacturer: Primary Weapons Systems Model: FRC Flat 3-Port Compensator Caliber: .22 to .375 Thread Pitch: 1/2x28 Shoulder: Square Type: 3-Port Compensator Length: 2.10 Mount Compatibility: Rearden Atlas Rearden Atlas XL Torque Spec: 35 ft-lbs