BOBRO Aimpoint Cantilever Mount Lower 1/3 Co-Witness<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> The Aimpoint Cantilever - 180 mount provides a lower 1⁄3rd co-witness when mounted on the AR15/M16 weapon platform. It features the Patented [US Patent 8，567，105] BLAC™ lever system which requires no manual adjustment to attain a proper， rock solid engagement on a 1913 Picatinny rail. </span></li><li><span class="a-list-item"> Must be compatible with any 1913 Specification Rail， to include systems that are out of specification (within reason) and this includes Weaver rails. </span></li><li><span class="a-list-item"> Must be completely 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. </span></li><li><span class="a-list-item"> Must lock with enough pressure to positively attach any device or optical instrument to a rail without movement， static or dynamic forces not withstanding. </span></li><li><span class="a-list-item"> The rail must not experience any deformation due to user error. This must include synthetic (plastic/polymer/composite) rail systems. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31UbjYbFTUL.jpg" noproxy>