Sig P320 Red Dot Adapter- MRA

Product Description

The Sig P320 Red Dot Adapter MRA is a mounting plate designed to interface between compatible red dot sights and the Sig P320 pistol slide. This adapter creates a secure platform for optic installation on P320 models equipped with the appropriate slide cut.

Mounting plates bridge the gap between your slide’s footprint and the optic’s mounting holes. The MRA adapter allows shooters to install red dot sights on their P320 without sending the slide out for custom machining.

This solution works for shooters who want to add a red dot to an existing pistol or who prefer a specific optic that requires adapter-plate mounting.

Key Facts

• Product Name: Sig P320 Red Dot Adapter MRA
• SKU: OTL-RDM-SIG01a
• Finish: Red
• Compatibility: Sig P320 platform

Which P320 Models Accept This Adapter

The P320 family includes multiple frame sizes and slide configurations. Some P320 slides ship from the factory with an optic-ready cut, while others require milling. This adapter fits slides that have been prepared to accept a mounting plate.

If your slide does not have a mounting-plate recess, you will need milling services before the adapter can be installed. Verify your slide configuration before ordering, or call 817-393-4000 for guidance.

Red Dot Footprint Compatibility

Optic mounting plates are footprint-specific. Each red dot sight uses a particular bolt pattern and recess dimension. The adapter must match both your slide’s interface and the optic’s mounting holes.

Confirm which optic footprint this MRA adapter supports before purchasing. Our optic plates and adapters page lists alternate configurations if you need a different footprint.

Installation and Torque Requirements

Mounting-plate installation requires removing the existing cover plate, cleaning the recess, positioning the adapter, and torquing screws to the manufacturer’s specification. Under-torquing allows optic shift under recoil; over-torquing can strip threads or crack the slide.

If you lack a torque wrench or prefer professional installation, Western Sport offers gunsmithing services at our Roanoke shop. Lance Rankin and our team handle optic mounting, sight installation, and slide work daily.

Buying from Western Sport in Roanoke, TX

Western Sport is a licensed FFL/SOT dealer and gunsmith shop serving North Texas and the DFW area since 2007. We stock optics, mounts, and accessories, and we offer gunsmithing for installation and fitment. Call 817-393-4000 to confirm compatibility or place an order.

Frequently Asked Questions

Q: Will the Sig P320 Red Dot Adapter MRA fit my P320 slide?

A: The adapter fits P320 slides that have a factory optic-ready cut or have been milled to accept a mounting plate. If your slide does not have a plate recess, you will need machining before this adapter can be installed. Call 817-393-4000 to verify your slide configuration.

Q: Which red dot sights work with this adapter plate?

A: Each mounting plate is designed for a specific optic footprint. Confirm which red dot models are compatible with the MRA adapter before ordering. Our team can help identify the correct plate for your optic at 817-393-4000.

Q: Can I install the Sig P320 red dot adapter myself?

A: Installation requires removing the cover plate, seating the adapter, and torquing screws to specification. A torque wrench and thread-locker are recommended. Western Sport offers installation services in our Roanoke gunsmith shop if you prefer professional mounting.

Q: How does an adapter plate compare to direct-mount optics?

A: Adapter plates allow you to use optics with footprints different from your slide’s native cut. Direct-mount optics eliminate the adapter, reducing height and part count. Plates add versatility when you want a specific red dot that does not match your slide’s factory footprint.

Q: Does this adapter raise the height of the red dot sight?

A: Mounting plates add thickness between the slide and the optic, which affects sight height and co-witness with iron sights. The exact height depends on the plate’s thickness and the optic’s design. Confirm the final configuration meets your co-witness preference before ordering.

Q: Where can I get the Sig P320 Red Dot Adapter MRA installed in North Texas?

A: Western Sport in Roanoke, Texas, provides optic mounting and gunsmithing services for the DFW area. Our gunsmith shop handles adapter installation, torque verification, and sight alignment. Call 817-393-4000 to schedule service or discuss your build.

Specifications

Compatible Sig Pistols:

• P320 base model.  DOES NOT WORK WITH THE X-5 or M17

Compatible Red Dot Sights (Mounting Screws INCLUDED):

• Trijicon RMR
• Doctor
• Insight MRDS
• Eotech MRDS
• Leupold Delta Point
• Leupold Delta Point Pro
• Vortex Razor
• Vortex Viper
• Vortex Venom
• Burris Fast Fire 2 & 3
• CMORE RTS & STS
• Sig ROMEO 3
• Shield RMS (requires a purchase of these screws)
• Holosun 507c/407c V1 versions (requires a purchase of 6-40 Screws For Holosun V1 Red Dot)
• Holosun 507c/407c V2 versions (requires a purchase of 6-40 Screws for Holosun V2 Red Dot)
• UTG Reflex Micro Dot
• TrueGlo
• Sig Romeo 3
• Sig Romeo 3 Max
• Sig Romeo 3 XL

Mounting Hardware:

• (2) 6-48 Weaver T-10 Torx® Head Screws
• (2) Sight alignment pins
• (2) M3 x 8mm Flat Head Screws
• (2) M3 x 6mm Flat Head Screws
• (2) M3 x 6mm Socket Head Cap Screws
• (2) 6-40 Flat Head Screws – RMR
• (2) M4 X 10mm Rounded Head Screws

Material: Billet 7075-T6 aluminum.  Dovetail is made of Steel with hardened dowel pins.
Finish: Black Anodize
Coating: Anodize
Dimensions: Length:  2.15″ Width: 1.06″
Additional Tools: T-10 Torx driver (not included). Why is my tool NOT included? Click Here
Purchase Tool

US Patent:  US D851,196S

Additional information