Close the gap between the optic and your Sig Sauer® P320™ slide and enjoy superior stability and lasting field service with the C&H Precision SIG RXP Romeo1 Pro FILLER to Trijicon® RMR® & Holosun® Optic Mounting Plate for Sig Sauer P320 Pistols. CNC-machined 6061 aluminum construction maximizes strength and rigidity for superior stability, while steel mounting hardware (included) provides a strong, sturdy, snug, and secure fit for your Trijicon RMR or Holosun optic. This filler plate is designed to close the gap between your pistol’s slide and attached optics to ensure you have the perfect line of sight when aiming. Each plate features a MIL-SPEC type III hard anodized coating for long-lasting corrosion resistance and dependable service in any high-stress tactical, target, or competitive shooting application. Compatible with Trijicon RMR & Holosun optics ONLY. Requires a Romeo 1 Pro Optic ready cut with Rear Mounted Reflex (RMR) sight cut holes (not included).