SIG P320 RX Series / Pro Series / AXG Scorpion w/ R1P / DPP CUT w/ RMR / Holosun Holes – Filler Plate for Trijicon RMR / SRO / Holosun 407C / 507C / 508C / 508T


(18 customer reviews)

Select which SIG 6-40 Screws you need: * 

Frequently Bought Together

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Price for all three: $64.85


This filler plate does not require any additional screws.  It is held in place with the RDS and it’s mounting screws.

The C&H Precision plates are designed, manufactured and shipped from our small family owned business in Coastal Georgia.  Each plate is precision machined to the tightest tolerances on HAAS CNC machines and each plate goes through multiple quality checks before shipping to our customers.


Thickness:  V4 MIL / LEO Plates are .095″ to .099″ thick

Material: Plates are made from 6061 aluminum.  All mounting hardware is Stainless Steel

Finish:  Plates are MIL-SPEC Type III Hard Anodized – Black


Qty 1 – Optic Plate

Qty 2 – 6-40 Mounting Screws

Qty 2 – 6-40 Optic Mounting Screws

Qty 1 – VC3 Thread Locker

Additional information

Weight .3 lbs



18 reviews for SIG P320 RX Series / Pro Series / AXG Scorpion w/ R1P / DPP CUT w/ RMR / Holosun Holes – Filler Plate for Trijicon RMR / SRO / Holosun 407C / 507C / 508C / 508T

  1. CAROLYN MORROW (verified owner)

    This is it! Finally the thing I was looking for. I ordered two other parts form other companys and they were not the right part. I got my red dot mounted and it looks great. (Holosun HS507)

    Thank You
    Carolyn Morrow

  2. David Rodriguez (verified owner)

    I purchased this for my AXG Scorpion. It fits perfectly and looks very high quality. Zero regrets on my purchase and my Trijicon RMR looks fantastic on the gun. Very glad I found this site. Highly recommended.

  3. Timothy Callahan (verified owner)

    Exactly what I needed to securely mount a 507c to my X5 Legion. High quality part and a great fit.

  4. Justin Brown (verified owner)

    I can’t say enough good things to say about this company. I had an issue with my work duty gun and needed this plate to fix it. I explained everything and had it in had by noon the next day. The plate works great and resolved all my issues. They have my business for life.

  5. Mark Haley (verified owner)

    I’ve recently purchased this plate to mount a Holosun 507C on my both my P320 AXG PRO and Scorpion. These plates are an absolute must and look awesome when installed. My only issue was the plate being a tad bit too long, which required me to bend the plate up slightly to fit the slide cut. It was a bit worse for the Scorpion, most likely due to the cerekote finish. My only other issue was the mounting screws. Sig has told me that the thread size is actually M4-o.7 and not the supplied #6-40.

  6. dv8skis (verified owner)

    I discovered that this plate will work well on a P226 Pro-Cut slide with about 10-15 minutes of slow and careful dremel work. Just grind off the tabs at the front and one of the bumps on the bottom to get a perfect fit. I mounted a 507C on my P226. pro-cut slide. Great product and great company.

  7. Tony Gongaware (verified owner)

    As described. Well done CHPW

  8. Dinero Greene (verified owner)

    Purchased this for a P320 with a Pro-Cut slide. Holosun is my preferred pistol optic. This plate is a must for this setup. Fills gaps and ensures a solid mount on the pistol. Great product!

  9. Darnell Laurent (verified owner)

    The is just what I needed. The only issue was the screws supplied with the plate were to long and caused a loading issue. I just used the screws that came with the HS507C X2-ACSS the longer set. Please advise if this is an issue or not. The screws supplied caused the extractor to lock where a round would not load.

  10. Patrick Foley (verified owner)

    I have been trying to put a MRDS on my home built P320 Xcarry for over a year, finally ADE recommended CHPWS and what a difference it makes having the flexibility to purchase a high quality dot without paying a sig CEO part of his salary. Thanks for creating the adapter plate, if anything I would suggest making the holes about .008 bigger to allow the screw threads to enter the slide without forcing. B but great product

  11. jimmod05 (verified owner)

    I found your web site and ordered the plate i needed to mount the 507c to my 320 classic. Delivery was fast and the plate was what was needed for a great fit. will be ordering from them again.

  12. Andrew Duncan (verified owner)

    I am very pleased with the optic plate for my Sig P320C AXG , absolutely perfect fit and perfect function, I mounted a Holosun 507C ACSS Vulcan green reticle, and everything works flawlessly.
    Also prompt shipping and good communication.
    Will definitely buy from again!

    Let’s go Brandon!

  13. Matthew Dunn (verified owner)

    Absolutely perfect machining! I installed a rm06 on a brand new X-series slide and couldn’t be happier with fit and finish. CH has a customer for life.

  14. Ray Bitting (verified owner)

    The SIG P320 RX Series Filler Plate was the perfect accessory for fitting my Trijicon SRO red dot as an option versus using my Sig Romeo Pro red dot on any of my Sig P320 RX slides. The fit and finish of the filler plate is flawless…thank you CHPW!

  15. Dennis Levine (verified owner)

    The plate fit my Sig P320 AXG like a glove and mounting a Holosun 507C X2 on it was breeze. Another excellent product from CH Precision.

  16. Tyson Adams (verified owner)

    The plate is very nicely crafted, excellent fit and very precise milling on the adapter plate, could not ask for a better crafted and perfect fit!!! Customer for life!!!

  17. John Chimera (verified owner)

    Fantastic Plate! As a firearms dealer I look for products that I can refer to my customers. I ordered this filler plate to mount my Holosun 507CX2 onto my own Sig P320 X-Carry. This plate was not only easy to install, but it looks great also. One of my biggest complaints is when company’s mill their pistols for red dot sights, and then require a mounting plate for particular sights that place the red dot at the same level as if the slide wasn’t milled. This plate is so thin, but fills the void in front of the Holosun sight. The screws received were the right thread pitch and length. Kudos to C+H Precision for making a quality product that does exactly what it is designed to do… and not breaking the bank in the process. I will definitely recommend your products to my customers in the future.

  18. Michael Massman (verified owner)

    Perfect fit! Installed a Trijicon RMR on P320 AXG Equinox. Couldn’t be any simpler. It seals the bottom of the RMR and fills the gap. Great product.

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