Glock 17R gen 3. The 17R has a resetting trigger designed to let you practice dry fire without having to rack the slide between shots. This gun DOES NOT FIRE LIVE AMMO. You can replace the top end with a standard 17.3 and it will fire. The 17R slide does not have a firing pin hole to allow for live fire. $250 for the frame, $400 for the conversion slide and internals, or $600 for the complete gun