MRAT Compensator Kit for FNX-45

This is the MRAT Compensator Kit for the FNX-45, a direct thread-on compensator designed to significantly reduce muzzle rise and felt recoil. The primary function of this component is to keep the front sight on target during rapid strings of fire, solving the problem of excessive muzzle climb that slows follow-up shots. A captive-spring guide rod assembly is included and required for proper cycling due to the reduced slide velocity produced by the compensator. The spring retaining nut is removable, allowing for spring replacement and additional tuning. Tested with a wide range of SAAMI Spec ammunition, from light target loads to +P duty rounds. Hand loads below SAAMI Spec pressure may induce malfunctions.

Compatibility

• FN FNX-45 (all generations)
• Direct thread-on installation (no barrel modification required)
• Requires use of included captive-spring guide rod assembly

Key Features

• Reduces muzzle rise by 40-60% depending on ammunition type
• Reduced felt recoil and faster sight return after each round
• Wings on comp body cover the gap between slide and comp for streamlined appearance
• Removable spring retaining nut for spring replacement and tuning
• FDE finish: Cerakote Magpul FDE H-267
• Includes captive-spring guide rod assembly (necessary for proper function)

Install Difficulty: 3/5

Moderate. Requires removal of the factory guide rod and spring assembly, then threading the MRAT comp onto the factory barrel. The included captive-spring guide rod assembly must be installed. Tools needed: barrel vise or padded clamp, appropriate wrench for comp installation. No permanent modifications required.

FAQ

Will this work with my suppressor?

No. The MRAT is a direct-thread compensator and does not have a suppressor mount interface. It replaces the barrel nut area and is not compatible with suppressor attachment.

What ammunition is recommended?

This kit was tested with SAAMI Spec ammunition ranging from light target loads to +P duty rounds. Hand loads with pressures below SAAMI Spec may cause malfunctions due to insufficient slide velocity. For best results, use factory ammunition within SAAMI specifications.

Can I change the spring weight?

Yes. The spring retaining nut is removable, allowing you to replace the captive spring for additional tuning if needed. This is useful if you experience cycling issues with certain ammunition types.

Ships within 1-3 business days. Covered by manufacturer warranty against defects in materials and workmanship. FDE finish is Cerakote Magpul FDE H-267.