Mepro MPO PRO-F Direct RMR Mounting Plate allows you to mount micro-pistol optics to GLOCK MOS Large Frame and MOS Standard pistols as well as FN509 and HK VP9. The CNC machined 6061-T6 Aluminum with Matte black Type 2 Hard Anodized finish ensure a solid direct slide-to-optic connection. Comes with mode-specific screws with Loctite pre-applied.