The Burris FastFire 4 is an open-emitter multi-reticle reflex sight on the Docter/Noblex (FastFire) footprint. It ships with a detachable Picatinny mount for rifle and shotgun use and offers four selectable red reticles to match the task at hand. Features: Open-emitter multi-reticle reflex red dot Four selectable red reticles: 3 MOA dot, 11 MOA dot, 3 MOA dot-in-circle, 11 MOA dot-in-circle Docter/Noblex (FastFire) footprint Includes a detachable Picatinny mount (rifle/shotgun-ready) CR1632 battery, ~26,000-hour runtime Automatic brightness with auto shut-off ~1.6 oz Mounts on the Docter/Noblex footprint or on the included Picatinny mount. An optional weather shield is available separately.