CMMG 55A1F0B Resolute FOB | 5.56 NATO | 16.1″ Barrel

The CMMG Resolute FOB (55A1F0B) is a semi-automatic AR-pattern rifle chambered for .223 Rem/5.56 NATO with a 16.1″ black nitride barrel and Picatinny rail receiver. It features B5 Systems furniture, ambidextrous controls, and a TriggerTech two-stage trigger for a deliberate, consistent pull. This configuration suits competitive and precision-oriented shooting where repeatable ergonomics and modularity matter; a Vortex Strike Eagle 1-8×24 makes a capable optic pairing under $1000 for this platform. Recommended applications include 3-gun competition and range training.

Product Specifications

• The UPC is 810144729992.
• The caliber is .223 REM/5.56 NATO.
• The barrel measures 16.1 inches and is finished in black nitride.
• The barrel finish is Black Nitride.
• The action is Semi-Auto.
• The trigger is a TriggerTech 2 Stage unit.
• The rifle is configured for Ambidextrous operation.
• The muzzle device is a CMMG Zeroed Muzzle Brake.
• The rate of twist is 1:7″.
• The receiver features a Picatinny Rail for optics and accessories.
• The overall length is 36.5 inches.
• The weight is 6.5 lbs.
• The stock material is SYNTHETIC.
• The stock color is BLACK.
• The series is FOB.

The Resolute FOB blends practical ergonomics and modern components into a familiar AR platform. Its ambidextrous controls and Picatinny-mounted receiver make it a flexible choice for shooters who value modularity and repeatable handling. Whether you’re running stages on the range or dialing in follow-up shots during competitive matches, this rifle is built to be serviceable, configurable, and straightforward in purpose.