Foxtail Precision 100020 – Superb Optic Plate

Description

The Foxtail Precision 100020 is an optic adapter plate from Foxtail Precision, listed for Mossberg 500 with a Trijicon RMR / SRO Holosun 407c / 507c interface.

Foxtail Precision 100020 Overview

An adapter plate lets a pistol red dot with one footprint mount to a slide cut for another, so you can run the optic you want on the pistol you own.

The plate must match both the slide cut and the optic footprint exactly, including screw size, so double check both before you order.

Fit and Compatibility

The distributor lists fit as Mossberg 500. Mount type: Trijicon RMR / SRO Holosun 407c / 507c. Height: 0.50″. Confirm the exact firearm model, receiver or slide cut, and the optic you plan to run before ordering, because mounting parts are made to precise dimensions and a near miss does not fit.

Installation Tips

Degrease the screws and mating surfaces, then snug the fasteners in an even, alternating pattern. Use a torque wrench and follow the maker’s inch-pound values; overtightening can crush a scope tube or strip threads, while undertightening lets the optic walk under recoil. A drop of thread locker on base screws, but not ring cap screws unless the maker says so, keeps everything in place.

Build and Materials

finished in anodized, with a listed weight of 0.11 lbs and a length of 5.60″. Machined aluminum and steel parts hold tolerances well, while polymer parts save weight and resist corrosion.

Holding Zero

The real test of any mount is return to zero: the optic should come off and go back on, or ride through hundreds of rounds, without the point of impact wandering. Rigid materials, precise machining and correct torque all contribute. Witness marks with a paint pen make it easy to spot movement at a glance.

Honest Limitations

No single mounting part fits every firearm and optic. Height, eye relief, footprint and rail spacing all vary, and a part that is perfect for one setup can be wrong for another. Budget mounts can work well on rimfires and light recoiling rifles, but heavy recoil and duty use reward premium machining.

Care and Storage

Wipe off dirt and moisture after a wet hunt with a microfiber cloth, keep a small set of the correct bits or wrenches in your range bag, and check fasteners at the start of each season. A light coat of oil on steel parts prevents rust, while anodized aluminum only needs to be kept clean. Protect the optic from dust and rain when the rifle is stored or cased.

Before You Buy

Match the part to your exact firearm and optic, check the height and size listed above, and contact us with the model of your rifle, pistol or scope if you are unsure. Mounting parts and optic accessories are not firearms and ship without an FFL transfer.

Common Setup Mistakes

The most common problems we see at the counter are simple ones: rings or mounts that are too tall or too short for the shooter, scopes mounted too far back so the eyepiece hits the brow under recoil, reticles that are not level with the rifle, and screws that were tightened by feel instead of to spec. Another frequent issue is mixing parts made for different rail standards, such as Weaver and Picatinny, which can let a mount shift. Take a few extra minutes during setup and the optic will reward you with consistent groups for years.

Specifications

• Brand: Foxtail Precision
• Manufacturer number: 100020
• Type: optic adapter plate
• Fits: Mossberg 500
• Mount type: Trijicon RMR / SRO Holosun 407c / 507c
• Height: 0.50″
• Finish: Anodized
• Weight: 0.11 lbs
• Length: 5.60″
• UPC: 5065018649189

Who It Is For

The Foxtail Precision 100020 is a great fit for pistol owners who want to run a different red dot footprint.

Buy the Foxtail Precision 100020 at MAG5 Firearms

MAG5 Firearms is a family-owned FFL in Collegeville, Pennsylvania. Order the Foxtail Precision 100020 online, or browse our scope mounting and optics categories for more. For factory details, visit Foxtail Precision. For general safe handling guidance, see the NSSF safety resources.