Ade Advanced Optics Rifle Scope Angle Mount Double 13-Slot Rail with Integral QD Lever Lock System Due to possible patent issue; This product will be discontinued/deleted as soon as current Amazon inventory sold out See-thru Thirteen-slot Integral Double rails for most versatile Applications Precision Machined from Aircraft-grade aluminum alloy with anodized black matte finish User friendly quick Detach lever lock with full Adjustability to fit on any Picatinny rail Clever Posi-lock Cross bolt design and spring tension Controlled locking plate with steel insert guarantees most secured installation