A steel optic plate with an integrated rear sight dovetail that mounts a Trijicon RMR, RMR HD or RCR on commercial M17/M18 and SIG P320 slides.
The OPF-P320, RMR, RSD is a drop-in adapter billet machined in 4140 steel and Melonite coated. RSD stands for rear sight dovetail: the plate carries its own dovetail so a rear backup sight can be fitted behind the optic. It is a collaboration between Forward Controls Design and TangoDown.
Key features
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Integrated rear sight dovetail — Lets a rear iron sight be installed on the plate itself.
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Billet 4140 steel — Steel rather than aluminium, Melonite coated.
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Hardware included — Supplied with plate-to-slide screws and T15 sight-to-plate screws.
Compatibility and fitment
- Not compatible with Army-issued M17/M18 pistols, whose slides use a slightly different plate mounting.
- Compatible: commercial M17/M18, P320 X-Five Legion, Legion Carry, and slides with the Romeo1 Pro / DPP cut.
- Not compatible: P320 Pro Cut, sub-compact, X Carry, AXG and RX.
- Sights: designed and made for the Trijicon RMR; the RMR HD and RCR are also compatible. With the RCR you must use the capstan screws supplied with the RCR.
- Do not use the 6-32 × 1/2 in screws supplied with the RMR HD — they are too long. Use 6-32 × 3/8 in screws (Trijicon's or the ones supplied with the plate).
- Holosun 507C, 508T and 509T (with the adapter plate it comes with) also work on the plate, but fit and function are not guaranteed for these sights.
- The integrated rear sight dovetail is made for commonly available Glock-pattern rear sights; Truglo makes P320 backup sights specifically for TangoDown/FCD plates. Do not force a SIG rear sight into the dovetail — it will damage the plate.
- When removing the factory optic cover plate, hold the loaded chamber indicator (LCI) down with a finger or a piece of tape: its spring is very small, fragile and easily damaged.
Technical specifications
| Material |
4140 steel |
| Finish |
Melonite |
| Plate-to-slide torque |
12 in·lb (1.4 N·m) |
| Sight-to-plate torque |
12 in·lb (1.4 N·m) |
| Country of manufacture |
USA |
In the box
- 1 × OPF-P320, RMR, RSD plate
- 2 × plate-to-slide screws, 4-40 × 3/16 in, Allen
- 4 × sight-to-plate screws, T15, 6-32 × 3/8 in
- 1 × packet of Vibra-Tite VC-3 threadlocker
Model information
| Brand |
Forward Controls Design |
| Model |
OPF-P320, RMR, RSD — commercial M17/M18 and SIG P320 plate with rear sight dovetail for Trijicon RMR / RMR HD / RCR |
| MPN |
OPF-P320, RMR, RSD |
