Franklin Armory's patented Binary Firing System (BFS ) is now available for your Glock 17 Gen3! The new G-S173 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. Easy to install Fits most Glock 17 Gen3 Firearms Selectable Semi and Binary (pull and release) Integrated mode indicator Optics ready (adapter plates sold separately. Click Here.) 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 DISCLAIMER: GLOCK is a federally registered trademark of GLOCK, Inc. and is one of many trademarks owned by GLOCK, Inc. or GLOCK Ges.mbH. Neither Sportsmans Outdoor Superstore nor this site are affiliated in any manner with, or otherwise endorsed by, GLOCK, Inc. or GLOCK Ges.mbH. The use of GLOCK on this page is merely to advertise the sale of GLOCK pistols, parts, or components. For genuine GLOCK, Inc. and GLOCK Ges.mbH products and parts visit www.glock.com.