The TruGlo 1” Picatinny riser mount is great for any AR-15 Flattop. Because AR-15 style rifles lack any drop at the comb, proper shooting posture for optics use can be difficult. The riser elevates the mount surface 1” to place the optic in a more natural position The 1” Picatinny riser mount attached directly to the existing Picatinny-style rail. CNC-machined aluminum Length is about 4” Raises mounting surface 1” The 1” Picatinny riser mount can be used to mount red dot style sights, but it is ideal for scopes.