Bobro Engineering Extended Precision Optic Mount Blac lever System which requires no manual adjustment to attain a proper, rock solid engagement on a 1913 Picatinny rail This mount requires absolutely no user adjustment, will not damage even polymer rail System Mil-Spec type III hard coat anodized in matte black ompatible with any 1913 Specification Rail, to include systems that are  out of specification (within reason) and this includes Weaver rails. ompletely tool and user adjustable free. It needs to be 100% self  contained and mate securely to any rail without the user having to  tailor the pressure/engagement position. Lock with enough pressure to positively attach any device or optical  instrument to a rail without movement, static or dynamic forces not  withstanding. The rail must not experience any deformation due to user error. This  must include synthetic (plastic/polymer/composite) rail systems. Auto Index capability. The unit must always repeat the forward shift (recoil forces direction  of influence) not only to maximize zero repeatability, but to take this  step of installation out of the users initial mounting sequence. Index  must be redundant. The system must incorprate a safety that prevents the lever from being accidentally opened.