FN 15 Guardian 5.56 NATO 16" Barrel 30+1 M-LOK Handguard Rifle

The FN 15 Guardian delivers precision-grade performance in a versatile platform built for serious shooters. This 5.56x45mm NATO rifle combines FN's military heritage with civilian-focused enhancements that elevate accuracy and modularity beyond standard AR-15 configurations.

What Makes This Different

The Guardian features a target-grade 16-inch barrel manufactured to tighter tolerances than standard offerings, delivering sub-MOA potential with quality ammunition. The slick-side upper receiver eliminates the forward assist for a cleaner profile while maintaining full reliability. FN's 15-inch M-LOK handguard extends nearly to the muzzle, providing maximum mounting real estate and improved balance compared to shorter alternatives.

Key Features

• Target-grade 16-inch barrel with 1:7 twist rate for heavy bullet stabilization
• Slick-side upper receiver with low-profile design and enhanced aesthetics
• 15-inch M-LOK handguard with continuous top rail and anti-rotation tabs
• 6-position collapsible stock with multiple length-of-pull adjustments
• Standard A2-style pistol grip with textured surface for secure hold
• 30-round magazine capacity with STANAG compatibility
• Flat-top upper receiver accepts all standard optics and iron sights

Field testing demonstrates consistent accuracy across various ammunition weights, with the 1:7 twist rate stabilizing bullets from 55 to 77 grains effectively. The extended handguard allows for natural shooting positions while accommodating bipods, lights, and other accessories without crowding. Weather-resistant finishes protect against corrosion in humid conditions, while the proven direct impingement system ensures reliable cycling across temperature extremes.

Technical Specs

• Caliber: 5.56x45mm NATO/.223 Remington
• Barrel Length: 16 inches with 1:7 twist rate
• Overall Length: 32.25-35.5 inches (stock collapsed/extended)
• Weight: Approximately 6.5 pounds unloaded
• Handguard: 15-inch M-LOK compatible aluminum
• Upper Receiver: Forged 7075-T6 aluminum, slick-side configuration
• Stock: 6-position collapsible with commercial buffer tube
• Magazine Capacity: 30+1 rounds
• Finish: Type III hard coat anodized
• Country of Origin: United States

FN's reputation for military contract reliability translates directly to civilian applications in this Guardian model. The combination of precision manufacturing and practical features creates a rifle that performs consistently whether used for competitive shooting, training, or recreational applications.