The AD-B2 modular base is the medium base in our modular lineup. It is designed to accept several different risers to accomodate a variety of optics. With no risers installed, it is the ideal base for the mini Acog. It is precision machined from 6061 T6 aluminum and finished in hard coat T3 Mil-Spec anodize. It features the patent pending Auto Lock™ Lever system to accommodate both in spec and out of spec rail systems.