Designed to fit any Picatinny optics rail on the market, the Burris Fast Fire RD red-dot sight is one of the most versatile aiming systems available. This rugged optic is constructed with an aluminum-alloy housing that reduces weight while also remaining durable and impact-resistant. In the Burris RD model, the improved electronics brightens up the aiming dot while also lengthening battery life, and the AAA battery supply allows the optic to run longer than its predecessors. The optic weighs in at 6.4 ounces. Mfg: Burris