Viridian RFX45 High Picatinny Adapter Mount for 1/3 Lower Co Witness Black

Cowitness mounting demands precision engineering that doesn't compromise sight picture. This Viridian adapter positions your optic at 1/3 lower height, maintaining iron sight alignment while delivering rock-solid Picatinny compatibility. Whether you're building in Daly City or across the Bay, TacticCAL Gun Store in Sunnyvale handles everything from inventory to FFL transfer in Sunnyvale with no complications.

Picatinny rail mounting and cowitness height

The RFX45 High Mount accepts standard Picatinny and ACRO footprint optics, giving you flexibility across red dot platforms. At 1/3 cowitness geometry, your iron sights remain visible and functional below the mounted dot—critical if your optic fails or you need backup aiming. TacticCAL Gun Store stocks this adapter for shooters who refuse single-point-of-failure setups. Weighs just 0.115 pounds and fits compact slide profiles without adding bulk. Browse our gun store.

Frequently asked questions

Does this mount work with Trijicon RMR and Holosun 507C optics?

Yes. The RFX45 accepts both RMR and ACRO footprint optics, which covers Holosun 507C, 508T, and similar modern red dots. Verify your specific optic's footprint before purchase.

Will 1/3 cowitness interfere with my pistol's existing irons?

No. The 1/3 cowitness height sits the optic above your iron sights, keeping them visible and usable for backup aiming or failover if the red dot fails.

What is an FFL transfer in California?

An FFL transfer is when a federally-licensed dealer like TacticCAL receives a firearm shipped from another seller and processes California's required DROS paperwork to legally transfer it to you. TacticCAL is your gun store Santa Clara in the Bay Area.