The Adapter Plates for Osight X is (an accessory) compatible with Osight X.
CH SGX-RSH-10-8 Adapter Plate (with built-in rear sight): Used for mounting Osight X on SIG SAUER P320 XFive Legion Series.
CH SG69-RSH-FIL Adapter Plate: Used for mounting Osight X on SIG SAUER P226/P229 RX / Pro / AXG Scorpion Series.
CH SG6L-RH-RSR Adapter Plate (with built-in rear sight): Used for mounting Osight X on SIG SAUER P226 XFive Legion Series.