What's in the Box Radical Firearms FR16 5.56 NATO Rifle with 16 inch Barrel, M-LOK Handguard, OD Green Stock (1) 30-Round Magazine Cable Lock Owner's Manual The Radical Firearms 16" SOCOM 5.56mm AR rifle uses MIL-STD Upper and lower receivers along with our 15" RPR free float rail system for increased accuracy, keeping your hands cool, and giving you plenty of room for accessories. Regardless if it s your first or fiftieth, a Radical Firearms AR rifle will not disappoint. Firearm Features FDE B5 Systems Stock and Pistol Grip Low Profile Gas Block Free-Float Handguard Firearm Specifications Manufacturer: Radical Firearms Model: RF01672 Caliber: 5.56 NATO Barrel Length: 16" Twist Rate: 1:7 Overall Length: 33"-36.25" Finish: Black and OD Green Grips: B5 Systems OD Green Pistol Grip Sights: None, Full-Length Picatinny Rail Magazine Capacity: 30-Rounds Additional Features: A2 Flash Hider