Our Optics mounting base for the B14r features 1913 spec picatinny rail. It is made from 7075 aircraft grade aluminium for excellent durabilty. It is type 3 hardcoat anodized. It features 10 miliradians of elevation cant (34.4 MOA). It features an ejection port cut to match the B14r action. It includes (4) weaver 6-48 screws for mounting.