Franklin Armory G-S173 Glock Binary Firing System Kit - For Glock 17 Gen 3 | Blue Anodized Trigger w/ 2 Free KCI 9mm Drum Magazine - 50rd | Gen 2 | Fits Glock 17, 19, 26, 34

In Binary mode, a single round is fired when the trigger is pulled and a single round is fired when the trigger is released. One of the revered safety features incorporated into all Franklin Armory BFS triggers is the ability to cancel the release round. To cancel the release round on G-S173, simply move the selector lever located on the slide from Binary to the “semi” position before releasing the trigger.

Featuring all-black, glass-filled polymer construction with hardened steel inserts, these 50-round drum magazines use heat-treated chrome silicon wire springs for maximum reliability and smooth feeding. Finger taps provide quick and easy reloading.