The Makasi MK-15 Platform merges a short-stroke gas piston system with familiar AR-15 Pattern controls. Designed for 5.56 NATO this bufferless pistol features 7075-T6 billet construction and 1913 rear modularity. – Operating System Short-Stroke Gas Piston / Bufferless Recoil / Non-Reciprocating Side Charging Handle – Build Materials CNC Machined 7075-T6 Billet Aluminum (Upper/Lower) / Makasi BCG – Barrel Specs 10.5 4150 CMV Nitride Barrel / 1:7 Twist / ½ x 28 Thread / 3-Prong Device – Rail & Interface 9 Makasi M-LOK Rail (1.34 ID) / Rear 1913 Picatinny Rail Mount – Features Ambi Takedown Lever / Mil-Spec Trigger / 30rd Mag Included / Flip-Up Sights Included – Weight 7 lb Total Weight – LIFETIME Warranty – USA Made