This AR-15, M16, M4 Tri-Rail Barrel mount fits on a Standard AR Barrel, Bull Barrel or Light Weight Barrels. This AR-15 barrel mount has 3 Picatinny rails for AR-15 accessories. Barrel Mount clamps securely around existing front sight housings and barrel compatible with A2 Front Sight and Bayonet Lug. Features Left, Right and Bottom Picatinny Rails, Each with 6 Slots. Picatinny rail cut allows mounting lasers sights, tactical lights, and a wide variety of other tactical accessories. Precision-machined from rugged Aircraft Aluminum with hard coated black anodizing. Aim Limited lifetime Warranty.