Foxtail Precision 100021 Optic Mount Plate for Mossberg 500 - Holosun 407K

The Foxtail Precision 100021 is a dedicated optic mount plate that brings mini red dot capability to your Mossberg 500 series shotgun. This adapter is cut for the Holosun 407K K-series footprint, giving Mossberg 500 owners a direct mounting interface between their shotgun receiver and a compact reflex optic.

Engineered specifically for the Mossberg 500 platform, the 100021 is part of Foxtail Precision's expanding lineup of firearm-specific red dot adapter plates, each CNC-fit to a designated host firearm. The plate installs to the shotgun receiver and provides the correct screw pattern and recoil lug engagement for the K-series mini reflex footprint, allowing a low-profile co-witness-ready red dot setup on a pump-action shotgun.

K-series footprint compatibility means the 100021 accepts the Holosun 407K and other optics sharing the same compact K-series mounting pattern, giving Mossberg 500 owners a streamlined way to add a modern aiming solution without modifying the receiver.