Optic base mount replaces the rear sight on a Glock® pistol. Allows you to install a micro dot optic with an RMR® base to your slide. Remove the rear sight from the Glock® slide and replace with the included dovetail adapter designed for Glock® rear sight dovetails. The optic base then bolts onto the dovetail adapter. VISM® SPD Micro (VDBSOLM) and the VISM® FlipDot ( VDFLIPGLO & VDFLIPGLOM2) optics are compatible with this mount. Aluminum Construction. DISCLAIMER: GLOCK is a federally registered trademark of GLOCK, Inc. and is one of many trademarks owned by GLOCK, Inc. or GLOCK Ges.mbH. Neither NcSTAR Inc. & VISM nor this site are affiliated in any manner with, or otherwise endorsed by, GLOCK, Inc. or GLOCK Ges.mbH. The use of GLOCK on this page is merely to advertise the sale of GLOCK tools, mounts, or optics. For genuine GLOCK, Inc. and GLOCK Ges.mbH products and parts visit www.glock.com.