Radical Firearms | FP75556M47RPR | 5.56 7.5″ RPR Pistol

The Radical Firearms RAD 556 M4 AR-pistol is a Mil-Spec forged upper and lower platform built around a short 7.5″ barrel and a 7″ RPR free-float handguard with M-LOK slots. The barrel is finished in Melonite and the bolt/carrier group receives the same corrosion-resistant finish. For a compact AR-platform pistol like this, a low-power variable optic such as the Vortex Strike Eagle 1-6×24 pairs well and keeps the sight picture fast and usable within 0–300 yards.

This configuration is suited for precision-focused range work and compact-carbine competition applications where a compact, maneuverable AR platform is preferred.

Product Specifications

• The manufacturer is Radical Firearms.
• The manufacturer part number / model string is FP75556M47RPR.
• The caliber is .223 Rem / 5.56 NATO.
• The barrel measures 7.5 inches.
• The twist rate is 1:7.
• The barrel finish is Melonite (Black).
• The barrel profile is M4.
• The gas system is Pistol length.
• The handguard is a 7″ RPR free-float M-LOK style.
• The upper and lower receivers are forged 7075 T6 with Type III anodizing.
• The firing action is Semi-Auto.
• The magazine capacity is 30 rounds.
• The number of magazines included is 1.
• The optic footprint is PICATINNY.
• The muzzle device is an A2 flash hider.
• The UPC is 816903022366.

This AR-pistol brings a forged, mil-spec approach to a compact platform: the long free-float RPR rail provides ample room for accessories while the Melonite-treated barrel and carrier finishes aim to reduce wear. The pistol tube buffer assembly with foam sleeve preserves the pistol form factor and keeps the build compact. The result is an AR-platform pistol built to the same basic standards found on full-size designs while remaining maneuverable.

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