Radical Firearms FP75556M47RPRBMPSB 5.56 NATO 7.5" Carbine

The Radical Firearms FP75556M47RPRBMPSB 5.56 NATO 7.5" carbine is purpose-built for operators requiring a compact, highly maneuverable rifle platform without sacrificing velocity or terminal ballistics. This short-barreled rifle (SBR) configuration excels in confined spaces—vehicle egress, room clearing, and close-quarters tactical environments—where traditional 16" carbines become unwieldy. Law enforcement tactical teams and civilian home-defense shooters alike benefit from the reduced overall length while maintaining the combat reliability and modularity the 5.56 NATO platform is known for.

The 7.5" barrel strikes a practical balance between ballistic performance and portability; at this length, 5.56 NATO rounds still achieve approximately 2,300–2,500 feet per second depending on ammunition load, sufficient for barrier penetration and standard target engagement out to 300 meters. The M4-pattern design features a flat-top upper receiver for optic mounting, a pistol grip lower receiver, and a threaded muzzle (1/2x28) to accept suppressors, compensators, or other muzzle devices essential for noise signature management. The monolithic or free-float rail system ensures precision and allows for rapid accessory reconfiguration without removing the barrel, critical when duty or training demands evolve.

This carbine is ideal for shooters who have completed proper federal registration and tax stamp procedures for SBR ownership, or for those in jurisdictions permitting pistol-configured builds. Compatibility with standard AR-15 magazines, triggers, stocks (if registered as a rifle), and aftermarket uppers makes the Radical Firearms platform economical to outfit and maintain. Pair it with a quality red dot or magnified optic, add a reliable light and pressure switch, and you have a verified, no-compromise close-quarters platform trusted by professionals.