C&H PLT ST SIG P320X TO RMR/SRO/HOLO

Description

The C&H Precision optics adapter plate for the Sig P320 X Series solves a specific problem: the Romeo1 Pro and DPP slide cut found on the M17, M18, and X-Series Legion pistols is a proprietary footprint that accepts neither RMR-pattern nor Holosun optics directly. This plate bridges that gap, letting you mount a Trijicon RMR, SRO, or compatible Holosun on a slide that would otherwise exclude them.

C&H machines the plate on HAAS CNC equipment and runs each unit through multiple quality checks before it ships. The steel construction adds a measure of durability at the interface between optic and slide — a relevant consideration on a carry or duty pistol where the joint sees repeated stress from recoil. Mounting hardware is included and, importantly, is sold separately as well, so a stripped or lost screw does not mean replacing the entire plate.

The dovetail feature in this variant allows a Glock-pattern rear sight to be fitted behind the optic, which matters if you want a usable backup iron sight without milling the slide or sourcing a suppressor-height front post. Getting the correct sight height for co-witness depends on your specific optic and mounting geometry, so C&H recommends confirming fitment before committing to a sight combination. The plate is made in the USA and fits the R1P/DPP cut found on the P320 X-Series and Legion M17/M18 family.