The UTG OP3 Micro SL Red Dot Sight is precision machined from 6061-T6 aluminum and is IPX7 waterproof rated for reliability. The OP3 SL features a 23mm wide field of view lens, crisp click adjustments, eight brightness settings, 15,000+ hour battery life, side loading battery compartment and is compatible with most optics ready pistol systems. The optic height of the OP3 co-witnesses with most suppressor height iron sights, and includes a removable low profile picatinny mounting base. Features Precision machined form 6061-T6 aluminumEight brightness settings15,000+ hour battery life at middle brightness settingSide loading battery compartment, no longer necessary to remove sight and re-zero when replacing batteryWide field of viewIPX7 waterproofRemovable low profile picatinny mounting base includedOptic height co-witnesses with most suppressor height iron sightsTertiary aiming point laser engraved on rear face of optic hoodLifetime warranty