Here's my glock 19 build. KJ g23 base with:
-Guarder Aluminum slide
-Guarder steel barrel
-Guarder g17 steel sights
-Guarder 150% recoil spring and guide
-GunsModify Salient Arms trigger (needed alot of mods)
- Gunsmodify g17 lightweight blowback unit
- Nineball piston head
The guns shoots a lot faster and snappier now. Gas efficiency is also really good. I haven't messed with the hop yet, only teflon taped the rubber to the inner barrel. It shoots 290FPS instead of 250FPS now.
Still need to install the Guarder frame. Unfortunately the guarder frame was designed to use the Glock 17 pin and not the smaller g26 style pin. So for the time being, i messed around with the kj frame.