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The XS Sight Systems Troy Folding Battle Sight Set with Tritium front and CSAT rear allow for shooting in a variety of situations and distances. Xs CSAT rear aperture is installed in Troy rear sight base and switch from CQB to long-range targeting without changing the rear aperture. The rear peep allows for traditional shooting out to 300 yards, while the top notch allows for CQB shooting. The XS 24/7 Tritium front sight post installed in Troy front sight base. Troy fip-up sight bases allow for a failsafe backup and sight bodies lock securely in place under powerful spring pressure. Bases attach securely to Picatinny rails using a standard screwdriver and no protruding knobs or levers to get snagged on.