Shield Sights Low Profile Slide Mount Plate for Glock 21 – RMS SMS Fit, Black (MNT-G21-POLY-SMS-RMS)

• Low profile mounting plate designed to attach micro optics onto Glock 21 slides
• Compatible with RMSc footprint optics and similar Shield pattern sights
• Installs by replacing rear sight without slide milling or permanent modification
• Sits flush with optic for streamlined profile and co witness capability
• Constructed in black finish for durability and consistent appearance
• Designed specifically for Glock 21 handgun platform fitment

The Shield Sights Mounting Plate Low Pro Slide Mount for Glock 21 is a pistol optic mounting plate designed for attaching micro red dot sights to Glock 21 slides. This mounting plate replaces the factory rear sight and provides a platform for installing RMSc-compatible optics without slide modification. It is used to mount optics while maintaining a low-profile configuration on compatible handgun platforms.

The Shield Sights Mounting Plate Low Pro Slide Mount for Glock 21 is finished in black and is designed to fit Glock 21 pistols using a rear sight replacement interface. It supports RMSc and SMSc optics and can also accept RMS, SMS, SMS2, and JPoint sights with noted overhang conditions. This optic mounting plate installs by sliding into the rear sight dovetail and securing the optic platform. In typical setups, this mounting plate is used for handgun optic installation in range use or field carry configurations.