What's in the Box Radical Firearms M4 Profile 5.56 NATO Semi-Auto Short-Barreled Firearm (1) 30-Round Magazine Cable Lock Owner's Manual The Radical Firearms 7.5" M4 Profile 5.56mm M4 profile short barreled rifle uses MIL-STD Upper and lower receivers along with their 7" 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 short barreled rifle will not disappoint! Firearm Features MIL-STD Safety 1/2x28 Thread Forged 7075 T6 Upper & Lower Receivers MIL-STD Forward Assist M-LOK Thin Freefloat Real Firearm Specifications Manufacturer: Radical Firearms Model: M4 Profile Caliber: 5.56 NATO Barrel Length: 7.5" Threaded Twist Rate: 1:7" Finish: Black Magazine Capacity: 30 Rounds