The Docter footprint
Docter / Noblex pattern (historically Doctersight). Two screws and four corner sockets to accept recoil pins. Older European standard, predates RMR's industry dominance. Used by Burris FastFire 2/3/4, Vortex Viper, Vortex Venom, Hex Dragonfly, Primary Arms SLx RS-10, Sig Sauer Romeo1 (original), Meopta Meosight, Viridian RFX25, and several other mid-2010s reflex sights.
Family: Docter / Noblex Screw count: 2 Mounting: screw_through