The Foxtail Precision Optic Mount Plate for the Mossberg 500 (brand part no. 100021) gives shotgun shooters a direct way to run a reflex sight without sending the receiver out for drilling and tapping. It’s built to the Holosun 407K footprint, so the sight seats flush and square without an adapter plate stacking extra height onto the sight picture. Foxtail Precision machines these plates specifically for the Mossberg 500 receiver, matching the factory drilling pattern for a secure, repeatable fit. For home-defense and duty shotguns where a fast reflex sight makes a real difference in target acquisition, a dedicated mount plate like this is the cleanest way to get there.

Key Specifications

• Mossberg 500 shotgun receiver compatibility, using the factory drilling pattern for a direct fit.
• Holosun 407K reflex sight footprint, so the optic seats flush without an adapter.
• Direct mount plate design, sold specifically for this receiver rather than as a universal adapter.

Frequently Asked Questions

Will this fit any Mossberg 500 variant? It’s machined to the Mossberg 500’s standard receiver drilling pattern, so it fits the core 500 platform.

Does this work with optics other than the Holosun 407K? The plate is cut to the Holosun 407K footprint specifically, so it’s built for that mounting pattern.

Buy the Foxtail Precision Optic Mount Plate for Mossberg 500

Order it from our Lubbock, Texas gun shop for fast, insured shipping — this plate ships direct, no FFL required, so it’s ready to bolt onto your 500 the day it arrives. Browse our full optics accessories lineup for more direct-fit mounting options.