The DOT Mount by Reptilia is a lightweight, slim-line mounting solution for a variety of red dot optics. Machined from billet 7075-T6 aluminum with Milspec Type III hard anodized finish, the DOT Mount attaches to any M1913 Picatinny rail, and offers lower 1/3 co-witness with standard AR15-style back-up sights. Its spring-loaded nitrided steel clamp and mounting bolt simplify the installation process, and sit flush with the body of the mount for a low-profile, anti-snag design. Like all Reptilia products, the DOT Mount is 100% made in the USA and carries a full lifetime warranty against manufacturer defects. Compatible with: Aimpoint - Micro R-1, H-1, H-2, T-1, T-2, CompM5 Sig Sauer - ROMEO4 , ROMEO5 & ROMEO-MSR Vortex Optics - Crossfire, Spitfire, Sparc I & II Primary Arms - Classic Series Gen II, SLx Advanced Rotary Knob Microdot, & SLx Compact 1A-20 Prism Scope - ACSS-Cyclops Holosun Technologies - HS403(not HS403A), HE403, HS503, HE503, HS515, HE515, & HE530.