The Bushnell RXM-300 Reflex Sight is a large lens red dot capable to fit any firearm for virtually any application from competition to self-defense. Designed in conjunction with world champion shooter KC Eusebio to serve as a competition-ready pistol reflex sight, the RXM-300's durable housing and included mounts expand versatility. It also boasts shake-awake and our exclusive EXO Barrier to shed water off the lens and keep you in the game when the weather turns. Comes with a weaver style low-profile mount, high-rise spacer for AR/MSR and is also compatible for direct connection to any mount or optics-ready pistol configured for the RMRA(R) / SROA(R) pattern and footprint. The dot is 4 MOA and is daylight-bright with battery life up to 35,000 hours. FeaturesMassive 24x28mm windowShake AwakeEXO BarrierBattery life 35,000 hours (4+ years) on mid-setting (Setting 8:12)