Franklin Armory's patented Binary Firing System (BFS) is available for your Glock 19 Gen3! The G-S193 allows you to select between semiautomatic and Binary modes to provide reduced split times and tighter groupings. Like all BFS triggers, the release round can be cancelled by simply switching back to semiautomatic while the trigger is depressed. Plus, you'll always know which mode you're in without having to come off your target with the integrated back plate mode indicator. Perfect for defense, sporting and recreational use. Features: Easy to install Fits most Glock 19 Gen3 Firearms Selectable Semi and Binary (pull and release) Integrated mode indicator Optics ready (adapter plates sold separately) Front and rear tritium night sights High-tactile front and rear serrations Anti-glare top stripe serrations Binary Trigger Operation: Position 1 - Semi - Fires 1 round per pull Position 2 - Binary - Fires 1 round on pull and 1 round on release