With its streamlined thumb-activated retention, the T-Series L3D Light-Bearing Red Dot Sight (RDS) Duty Holster keeps your firearm at the ready while maintaining total security. Compatible with Trijicon RMR/SRO, Leupold Delta Point Pro, Sig Romeo1Pro, and other similar sized optics, the T-Series RDS Holster has an additional rotating dust cover to further protect optics from impacts and debris--removable if desired