This durable, all steel sight mounts on the same plane as the rear sight to give you a backup iron sight. The Yankee Hill Machine YHM-9627 Same Plane Flip Front Sight folds out of the sight line with the simple push of a button and flips and locks in the deployed position with ease. Easy and fast. Mounts quickly and easily with the included thumb screw. The Same Plane Flip Front Sight accepts all standard AR sight posts and hardware which is included.