Optic Adapter Plate - Sig P365X/XL to Trijicon RMR/Holosun "C" Series

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For years, serious shooters have desired to mount Trijicon RMRs to slides with narrow profiles such as the Glock 43, Sig P365 and the Smith and Wesson Shield. We now have a practical answer.

Our RMS to RMR adapter plate mounts directly to the Shield RMS/RMSc optic cut footprint (machined into the slide) and allows the user to mount a Trijicon RMR securely to the adapter plate!


NOTE: This plate is compatible with the Sig P365XL ONLY. If we machined your P365 slide please choose our P365 plate.

Each plate will ship with one set of M3x.5x8mm screws to secure the plate to the P365XL slide, and one set of custom length 6-32 screws. Recommended torque value for all screws is 11in/lbs.



It is solely the responsibly of the customer to ensure the correct fasteners are used and proper safe function of the firearm is maintained. If you have any questions, contact a competent gunsmith for help!



The major advantage of this system is the freedom to choose either to mount the Shield RMS/RMSc series of sights directly to your slide or to choose to mount the battle proven Trijicon RMR!


Our RMS to RMR adapter plate is CNC machined from billet 7075 aluminum alloy (almost twice as strong as the more common and cheaper 6061 Aluminum) and Type 3 Hardcoat anodized black. To minimize unnecessary weight, the plate has had as much material machined away as possible without sacrificing any structural integrity.

32 Reviews Hide Reviews Show Reviews

  • 5
    Trijicon RMR adapter for Sig p365

    Posted by Chris Phillips on Jul 30th 2020

    Excellent fit and finish. Perfect solution for mounting the RMR to a p365. Shot 400 rounds after install and everything was great.

  • 5
    Sig P365XL RMR adapter plate

    Posted by Brandon on Jul 21st 2020

    Installed easy. Tolerances are on point no play in the optic at all. Would recommend if you want something other than the polymer Romeo zero on your Sig P365XL

  • 5
    p365xl rmr adapter plate

    Posted by Tayton on Jun 25th 2020

    This thing simply works. Definitely a no-brainer if you have an RMR and don't want to spend >$300 on an optic solely for the p365xl

  • 5
    Just what the doctored ordered

    Posted by Albert on Jun 23rd 2020

    Nicely machined, fit and function are excellent. Works as expected.

  • 5
    Excellent quality

    Posted by Rodney on Jun 8th 2020

    It fit like it was meant to be there. The RMR fit perfectly and the adapter plate fit the 365XL perfectly.

  • 5
    Quality product!

    Posted by Eric on Jun 7th 2020

    The fit and finish on this product is outstanding. Excellent value for the money and it works exactly as it should.

  • 5
    P365XL Trijicon optic plate

    Posted by Ian Lowe on May 29th 2020

    I chose this plate because I think it is the best option for mounting my RMR to my P356XL's pre-milled slide. This plate is so much sleeker than the outer impact one in my opinion. They also communicated with me through the order. Very happy with this purchase. Would recommend

  • 5
    Sig Sauer P365XL to RMR Maple leaf Arms adapter plate

    Posted by Sam Sipes on May 29th 2020

    Product was as described, fast on-time shipping and fits perfectly! I am very pleased with the craftsmanship of the adapter plate. At first I was a little worried the RMR would be too big or the plate would make it sit too tall, but once installed it completely blew me away! Love the Reliability of the Sig Pistol platform and also of the trijicon RMR's & Mapple Leaf helped make that possible and for cheap! Thanks guys!

  • 5
    P365XL Optic Adapter Plate

    Posted by Peter Fiedler on Jan 15th 2020

    I just received my optic adapter plate for my P365XL. I installed it on the pistol last night and attached my Trijicon RMR Type 2 without a single issue. The entire job took me about 10 minutes. The fit and finish on the plate are superior quality, to say the least.
    I highly recommend this solution if you want to attach an RMR or another optic besides the Sig Romeo Zero...that is whenever it actually is delivered to dealers!