American Defense MFG, LLC. was founded with an idea and hard work. The result was the patented QD Auto Lock System. The AD-T1-L mount is designed for the Aim point T-1/H-1 Micro and is the lowest mount we offer. This mount also fits the Vortex SPARC and Primary Arms Micro Dot. It is precision machined from 6061 T6 aluminum and finished in hard coat T3 Mil-Spec anodize. It features the Patented QD Auto Lock Lever system to accommodate both in spec and out of spec rail systems.