Primary Weapons Systems FRC 2-Port Compensator Features The Primary Weapons Systems FRC 2-Port Compensator is a tapered shoulder muzzle compensator threaded at 5/8x24 engineered specifically for .308 caliber and compatible barrels with a tapered shoulder profile and purpose-built to serve as a suppressor host for the Rearden Atlas and Atlas XL mounting systems. The 2-port design skillfully redirects muzzle flash away from optics and the shooter s line of sight maintaining a clear unobstructed sight picture during rapid fire while minimizing the distracting overpressure that affects conventional muzzle devices. When paired with a compatible Rearden Atlas or Atlas XL suppressor the FRC 2-Port Compensator delivers a tight lockup that holds through hard shooting cycles without loosening or shifting under sustained fire. The tapered shoulder 5/8x24 2-port compensator and suppressor host covers calibers from .22 to .338 on the 5/8x24 configuration providing compatibility across a broad range of centerfire rifle platforms running tapered shoulder barrel profiles at this thread pitch. The compact 1.64 overall length adds minimal protrusion beyond the muzzle while still delivering effective flash management and a reliable suppressor mounting interface for Rearden Atlas and Atlas XL adapters. The FRC 2-Port Compensator is also available in a 1/2x28 configuration covering calibers from .22 to .375 for smaller bore and pistol-caliber carbine platforms that the 5/8x24 version does not cover. Primary Weapons Systems FRC 2-Port Compensator Specifications Manufacturer: Primary Weapons Systems Model: FRC 2-Port Compensator Type: 2-Port Compensator Thread Pitch: 5/8x24 Shoulder: Tapered Caliber Compatibility: .22 to .338 Primary Application: .308 Caliber Mount Compatibility: Rearden Atlas Rearden Atlas XL Length: 1.64