Ultimate Arms Gear Tactical Combo Combination Package Kit Set Include - Precision Machined Aluminum QD Weaver Picatinny Front High Profile BUIS Flip Up Backup AR15 AR-15 M16 M4 M-4 A1 A2 Post Back Up Iron Tower Sight Mount Front Sits on Gas Block + Steel A1 A2 Front Sight Dual Headed Adjustment Tool 4 and 5 Prongs