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. Mfg: Truglo