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C+H Precision Optics Adapter Plate with 10-8 Rear Sight for SIG P320 Legion (X-Five/M17/M18) with Romeo 1 Pro Optic Ready Cut and Trijicon RMR/SRO, Holosun 407C/507C/508C/508T

4.5 (8) Write Review
Free shipping on orders over $29.99

$142.99

$ 64 .99 $64.99

In Stock

About this item

  • COMPATIBILITY: ONLY compatible with SIG P320 Legion models with Romeo 1 Pro Optic Ready RMR/DPP Cut. P320 M17, P320 M18, P320 XCarry Legion, P320 XFive Legion, P320 XFive California Complaint, P320 XFive SXG, P320 M17 Ceremonial, P320 M18X, P320 M17X, P320 M18 California Compliant
  • OPTIC COMPATIBILITY: ONLY compatible with Trijicon Type 1 & Type 2 RMR & SRO. Compatible with Holosun 407C, 507C, 507Comp, 507C X2, 508C, 508T, 508T X2. Compatible with C+H COMP & EDC-XL. NOT compatible with Trijicon RCR.
  • DOUBLE THE THREADS, DOUBLE THE RELIABILITY: Patented T-Nut mounting system features 6 to 7 threads of engagement—nearly double the competition—offering 2X the security and reliability.
  • ULTRA THIN PLATES: Our patented ultra-thin plates are designed to be slimmer and lighter than the competition, reducing height over bore and enabling quicker follow-up shots.
  • PRECISION MACHINED AIRCRAFT ALUMINUM: Crafted from aircraft-grade aluminum, our plates are precision machined and MIL-SPEC TYPE III hard coat anodized to surpass industry standards for durability and quality.
  • This plate requires a Romeo 1 Pro Optic Ready Cut. Refer to the images above to verify your slide has the correct holes and cut.


Great Product


Artak Simonyan
Reviewed in the United States on February 5, 2025
The plate itself is perfect fit great and mounted right up the only issue I had was the threaded pin posts one of them snapped as soon as I torqued it , thankfully there was a spare other than that 10/10.
Kindle Customer
Reviewed in the United States on February 17, 2025
Fits perfectly on my X5 legion. Also love that it came with 3 different sets of screw lengths for mounting different dots. Good fit for my holosun 507comp.
Colin S.
Reviewed in the United States on January 8, 2025
Paired with a SwampFox Liberty (with the Ironsides Shield). The little 'legs' for the plate threw me off a little, but a quick call to C+H Precision's customer service and my confidence was restored. I'm using the OEM front site, and the red dot disappears perfectly when the front and rear iron sights are aligned. I'm sure if the protective Shield on the Liberty was not there, the red-dot would align perfectly. But for my application and MacGyver abilities, it does the job.Just don't tell my wife how much I actually paid for it, and I'll be fine. 10/10 would recommend.
Lance
Reviewed in the United States on April 3, 2025
Doesn’t support the holosun I ordered. Expensive mistake
Henry IV
Reviewed in the United States on April 18, 2025
High quality metal and finishing, well machined holes and bevels, fits into mounting plate location on rear of Sig M18 perfectly, T-Lok backing threads system works well. These are the reasons it's getting 2 stars instead of 1.This is because: the listing for the plate clearly (as of the time of this review) states that it is compatible with the "P320 M18" - yet the height of the rear sight is nowhere near correct. Comparing with the removed factory sight (which comes off when you remove the factory top cover) of the M18, the height of the rear notch is at least TWICE as tall as required for alignment with the front sight. Despite seeing the huge difference in sight notch height right away when I received it, I gave it a shot anyway and installed it completely along with the optic. Nope! Using a 9mm Sightmark laser boresight to confirm, the massive height of the rear notch means horrendous misalignment using iron sights. The Holosun 507C sight I put on it couldn't even adjust aim point low enough in the glass to compensate even at 10 ft. When aligning the Holosun aim point with the Sightmark laser from the barrel at approx. 15m, the built-in rear sight of this plate was so tall it obscured the holograph aimpoint too.I have no idea if the other Sig models it claims to be compatible with have such tall rear sights that this might work well on, but for the M18 that it claims compatibility with it is completely not correct for the backup iron-sight ability it's supposed to provide.
Mr. D
Reviewed in the United States on April 15, 2025
I’ve searched all over for the right figment plate this for an Sig Sauer P320 M18.
Mlargis
Reviewed in the United States on October 26, 2024
The plate fit my P320 perfectly to allow my optic to mount to it. Very low profile but still sturdy enough to keep the optic in place through over 1000 rounds.
Cachirulo Milonguero
Reviewed in the United States on October 1, 2024
This product fixed the mounting issues I was having with my RMR sight. Now my RDO is fitted, snug and holding zero. It seems that the stock mounting holes in the Legion slide is too short and the thread size/pitch didn’t match the screws that came with my sight. No mater what I tried, I just couldn’t get the sight mounted securely. At least not until I got this adapter plate. This adapter plate is over engineered and is attached using the larger screw holes available in the slide. The adapter plate provides pegs for the RDO to align with as well as its own screws to attach the RDO to the plate. All in all a very well designed product for a very specific application to solve a unique issue of mounting any RMR RDO to the P320 X5 Legion. This is a must have and worth every penny for the amount of time and frustration it will save you.