The AD-170S is a more compact version of the AD-170.  Made from precision-machined 6061 T6 aluminum and finished with a hard coat T3 Mil-Spec anodize, it features the patented QD Auto Lock™ Lever system, which ensures compatibility with both in-spec and out-of-spec rail systems....

PM35S: Digital Scope Mount Picatinny 35MOA Standard PM20L: Digital Night Vision Scope Mount Picatinny 20MOA Long