Ultimate Arms Gear Tactical Combo Combination Package Kit Set Precision Machined Aluminum Black Post Low Profile Front & Rear Iron Sight Tower Flat Top with Elevation Wind Adjustment Built in Integral Weaver - Picatinny Mount Deck "QD" Quick Detach Detachable Removable Simple Retention Thumbnut Locking AR15 AR-15 M16 M4 M-4 Flattop A1 A2