Although many modern pistols feature Picatinny rail sections molded or machined into their dustcovers, most do not have their slides’ tops machined for the mounting of red-dot sights. UM Tactical has addressed that situation with a universal machined aluminum mount that slides on and locks to a handgun’s accessory rail and cantilevers upward and backward to a section of Picatinny rail above the slide. Once an optic is attached and sighted in, the entire assembly can be removed and replaced with the press of a button—and without a loss of zero. The real genius with UM’s system, though, is a companion holster of molded Boltaron that engages the mount rather than the pistol. The design allows a single holster to work with a variety of pistol shapes and brands. The UM3 Combo Package includes the UM3 mount and UMH3 holster. Price: $135. Contact: UM Tactical; (866) 979-4486; umtactical.com.