Description
Adding a red dot to a Mossberg 500 used to mean a tall rail or a trip to the gunsmith. The Foxtail Precision 100020 skips all of that. It's a direct mounting plate that uses the factory drilled-and-tapped holes on your receiver, so you keep the shotgun exactly as it came from Mossberg and still get a mini red dot sitting right where you want it. No milling, no custom cuts, just line it up and torque it down.
What the Foxtail 100020 Bolts Onto
This plate is cut for the RMR footprint, which makes it one of the most versatile options out there. That means the Trijicon RMR and SRO drop right on, along with the whole family of Holosun optics that share that pattern like the 407c, 507c, and 508t. Plenty of other RMR-pattern dots will work too, which gives you room to swap optics down the road without buying a whole new mount. Fitment is aimed at the Mossberg 500, and the same receiver hole pattern carries over to a lot of the 590 and Shockwave guns as well.
Why a Low Mount Matters on the Mossberg 500
Mounting your dot close to the bore keeps the sight picture natural and cuts down on the head movement you get with taller setups. That low profile helps you get on target faster whether you're running clays, working a home-defense gun, or chasing turkeys. Foxtail builds these plates to hold zero under shotgun recoil, so once you sight it in it stays put.
Foxtail Precision runs their shop out of Minneapolis and has built a reputation on tight-tolerance adapter plates for pistols and long guns alike. If you already trust their pistol plates, the Mossberg version brings that same fit-and-finish to your shotgun. Keep in mind the optic itself is sold separately, so pair it with the RMR-footprint dot of your choice and you're set.
Key Specifications
- Manufacturer: Foxtail Precision
- Manufacturer Part Number: 100020
- UPC: 5065018649189
- Model Number: 100020
- Type: Red Dot Optic Mount Plate
- Firearm Fitment: Mossberg 500 (factory drilled-and-tapped receiver)
- Optic Footprint: RMR
- Compatible Optics: Trijicon RMR, Trijicon SRO, Holosun 407c/507c/508t and other RMR-pattern dots
- Mounting Method: Direct mount to factory receiver holes, no milling required
- Finish: Black
- Optic Included: No
What’s Included
- Foxtail Precision 100020 optic mount plate
- Mounting hardware
Frequently Asked Questions
What optics fit the Foxtail 100020 Mossberg 500 mount plate?
The plate is machined for the RMR footprint, so it accepts the Trijicon RMR and SRO along with Holosun models that share that pattern like the 407c, 507c, and 508t. Most other red dots built to the RMR footprint will also fit. Keep in mind the optic is sold separately.
Do I need to drill or mill my Mossberg 500 to install this plate?
No. This plate uses the factory drilled-and-tapped holes already on the Mossberg 500 receiver, so there's no gunsmithing required. You just line the plate up over the mounting holes and torque it down with the included hardware.
Will the Foxtail 100020 hold zero under shotgun recoil?
Yes. These plates are built to lock solidly to the receiver and stay put under the heavy recoil a shotgun dishes out. Using a thread locker on the screws and torquing them properly will keep everything zeroed shot after shot.
Does this plate fit the Mossberg 590 or Shockwave too?
This one is listed for the Mossberg 500, but the 590 and Shockwave models often share the same factory receiver hole pattern. If you're mounting to something other than a standard 500, it's worth confirming your specific receiver has the matching drilled-and-tapped holes before ordering.




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