The Norsso Tiger Claw 3.0 Slide uses the Trijicon RMR optic cut. This means you can direct mount optics that share the RMR footprint such as the Trijicon RMR, Trijicon SRO, Trijicon RCR, Holosun 407C, Holosun 507C, Holosun 507 Comp, Gideon Optics Omega, Meprolight MPO-F & much more.