The OuterImpact 45 degree offset optic mount is able to accept 3 separate tops. The mount you are purchasing is compatible with all of the red dots listed below. Using the other available tops (sold seperately), the 45 degree offset mount is compatible with all optics using the Aimpoint Micro Standard (38), and also the Trijicon MRO Standard (3) footprints. The mount only takes a couple of minutes to install on any Picatinny Rail type. The 45 degree offset optic mount is: ambidextrous low-profile lightweight steel reinforced snag-less design retains cheek weld designed to co-witness with Magpul Back Up Offset Sights ideal for close-range shooting an extremely stable platform for your optic precision machined Made in the U.S.A. The 45 Degree Offset Optic Mount is made of billet 7075 aircraft aluminum and is hard coat anodized. The 45 Degree Offset Optic Mount attaches to the rail using a steel dowel reinforced clamp. All mounting hardware is included with the exception of the Aimpoint Micro optics. The OEM optic screws must be utilized. MRA Compatible Red Dots: Trijicon RMR/SRO – some weapons may experience ejection issues using the SRO Docter Insight MRDS Eotech MRDS Leupold Delta Point Leupold Delta Point Pro Vortex Razor Vortex Viper Vortex Venom Vortex Defender CCW Burris Fast Fire 2 & 3 & 4 CMORE RTS & STS Shield RMS – requires a purchase of these screws Holosun 507 ”C”/407 ”C” V1 versions – requires a purchase of 6-40 Screws For Holosun V1 Red Dot) Holosun 507 ”C”/407 ”C” V2 and X2 versions – screws included in OuterImpact Screw Pack Holosun 507 ”K”/407 ”K” models require the Micro adapter Holosun 508 ”T” UTG Reflex Micro Dot TruGlo Tru-Tec Sig Romeo 3 Sig Romeo 3 Max Sig Romeo 3 XL Crimson Trace CTS-1250 Springfield Hex Dragonfly – must also use OEM provided spacer plate Bushnell RXS-100 and 250 Kahles Helia RD