The Radian Weapons Guardian Optic Mounting System (brand part no. H0021) wraps a Holosun HS507C in a protective housing built for Glock MOS slides, guarding the optic from top, front, and side impacts. Machined from hard-anodized 7075 aluminum, the housing uses a STUD-LOK threaded stud/nut interface for longer thread engagement, greater hold-down power, and more shear resistance than a standard screw-down plate. TRU-SEAL, pre-installed O-rings on the mounting screws, keeps the plate watertight against the slide and seals moisture out of the mounting threads without needing an extra sealing plate. Optional back-up sights sit forward of the optic for an unobstructed iron sight picture if the red dot ever fails.

Key Specifications

• Fitment: Glock MOS slides, sized for the Holosun HS507C footprint.
• Material: hard-anodized 7075 aluminum.
• Protection: top, front, and side impact protection, for the optic housing.
• Mounting interface: STUD-LOK threaded stud/nut system, for long thread engagement and shear resistance.
• Sealing: TRU-SEAL pre-installed O-rings, keep the plate watertight against the slide with no separate sealing plate needed.
• Sight compatibility: optional back-up sights, sit unobstructed, forward of the optic.

Frequently Asked Questions

What optic footprint does the Guardian fit? It is sized for the Holosun HS507C footprint on Glock MOS slides.

Does the Guardian protect against impacts? Yes, the housing is designed to guard the optic from top, front, and side impacts.

Do I need a separate sealing plate? No — TRU-SEAL pre-installed O-rings on the mounting screws keep the plate watertight against the slide on their own.

Buy the Radian Guardian Optic Mount for Glock MOS

Protect a Holosun HS507C from impact and moisture in one housing — order the Radian Guardian from Schaefer Defense and browse our full handgun parts selection for more Glock MOS optic solutions. Ships fast from our Lubbock, Texas gun shop.