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Host Guns

Any Staccato(STI) pistol that was manufactured in 2018 or earlier and designed to mount a plate and optic.
HOST pistol examples: Omni, Host, Costa Host and some Tacticals
The DUO system replaced the HOST system on Staccato pistols manufactured in 2019 or later.

There are 4 plates that came with the pistol and each plate has a letter stamped into the metal.
T = Trijicon RMR
C = C-more STS
L = Leupold DeltaPoint Pro
V = Vortex Viper

All optics mount the same way.

No. The rear sight is screwed to the plate and does not utilize a dove cut.