This is my second G17 Sub2K and it seems to run just like the original. I shot 200rds total which included 124gr. RWS FMJ, 147gr. Gold Dot HP and 115gr. UMC Remington HP ammo. Everything fed, fired and ejected perfectly. Accuracy was excellent with the Gold Dots getting the best group which was 1.5 to 2 inches at 25 yards.
This time around I did some upgrades I didn't do to my original Sub2K. First is the TK front fiber optic sight and aluminum adjustment screws. This sight was much nicer to shoot with than the factory front sight blade. In a thread over at Ktog I talk about how it's canted to far to the right and now I know why. Tightening down the adjustment screws even a little beyond just touching warps the plastic base walls. If I didn't do this though, the sight would easily move. My solution was to adjust it correctly and then fill every available space around the sight with black RTV after tightening the screws which included the middle one. It held up perfectly fine and never moved and is now perfectly centered. I'm not worried about readjusting it since it shot perfectly with 3 different ammo weights.
Second upgrade is the Tacticool tube and charging handle cover. This is a common upgrade and provides a much nicer cheek weld and gripping surface for the handle.
Third upgrade is the Aztac aluminum trigger. It has a more solid feel over the factory trigger and feels better due to the wider trigger face.
Fourth upgrade is a Magpul rail that I bolted to the factory forend. On it is a Surefire G2X-D held on with a GG&G 1" mount. I shot the Sub2K with the light on and everything is still nice and solid.
Fifth upgrade is the KT stock extension. Some people don't like it, but it works well for me and it hasn't moved a bit just like on my original Sub2K. You have to make sure to get it fully seated or it will slip off since not installed correctly.
That's it for the upgrades. I used 33rd. Glock factory Gen 3 & 4 magazines as well as a G17 Gen 4 Glock factory magazine. I have more G17 mags coming my way since I like the idea of having it folded and compact, but still have a fully loaded magazine ready to go. Overall I'm pleased that this Sub2K did not disappoint like my original.