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Running a red dot on a pump gun changes how fast you get on target, and this Foxtail Precision mounting plate is the clean way to make it happen on a Mossberg 500. It adapts the receiver's factory mounting holes to accept a Holosun 407K, giving you a solid, low-profile home for your optic without sending the gun off to a smith. The 407K shares the Holosun K footprint, which is a slightly tweaked version of the popular Shield RMSc pattern, so the plate lines the dot up right where it belongs above the bore.
Foxtail Precision builds these plates from CNC-machined aluminum with a black anodized finish, deburred and cleaned up so there are no sharp edges to catch on. The whole point is rigidity. A shotgun recoils hard, and a sloppy mount will let your zero wander shot after shot. This plate is cut to sit flush against the receiver and stay locked in place, which is exactly what you want when a 12 gauge is pushing back against your optic every time you pull the trigger.
Installation is straightforward if your Mossberg 500 is already drilled and tapped up top, which most are. The plate uses the receiver's existing screw holes, so it's a bench job with a screwdriver rather than a gunsmith visit. Mounting hardware comes in the box. A dab of thread locker on the screws and a proper torque spec are smart moves here, since vibration and recoil are the two things most likely to back a screw out over time.
This setup shines on home-defense builds, 3-gun and competition guns, and turkey rigs where a dot beats fighting with bead sights. If you already run a Holosun 407K or plan to pick one up, this plate is the bridge that gets it riding on your Mossberg cleanly and reliably.
It's built to mount on Mossberg 500 receivers that are drilled and tapped up top, which covers the majority of them. Keep in mind Mossberg changed their screw pattern in 1997, so it helps to know whether your gun uses the older 6-48 holes or the later 8-40 holes before you order screws or start the install.
This plate is cut for the Holosun K footprint, so anything sharing that pattern will drop right on. That includes the Holosun 507K, EPS Carry, and other K-footprint red dots. Since the K footprint is closely related to the Shield RMSc pattern, optics on that footprint generally line up as well.
No, this is a DIY bench job for most people. The plate uses the receiver's existing mounting holes, so there's no milling or machining involved. All you really need is the right screwdriver, some thread locker, and a little care not to over-torque the screws.
That's the whole idea behind a rigid machined plate. Shotgun recoil is what usually walks a cheap mount out of zero, so a tight, flush-fitting aluminum plate paired with thread locker and proper torque keeps your Holosun 407K locked down. Just re-check your screws after the first range session to be safe.
| UPC | 5065018649196 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 100021 |
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