The Radical Firearms RAD-15 RDR .223 REM 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. The B5 Type 23 Grip and B5 Bravo Stock provide a comfortable hold on the rifle in any shooting position. - CALIBER .223 REM - MAGAZINE (1) 30rd capacity - BARREL 16" 4140 Chrome Moly Vanadium, 1:7 Twist, A2 Flash Hider - RECEIVERS Forged 7075 T6 - HANDGUARD 15" RDR Rail System - TRIGGER Mil-Spec - STOCK 6-position adjustable