I heard the stupidest thing...that the FBI was having a hard time lifing fingerprints off of the grips so the USDOJ reached out to Glock and Glock agreed to stop making that particular grip.
I know it sounds stupid and your right, it's a great gun.
On the other hand, so many people on GT have been slamming the Gen 4's for not working properly. I just spent a couple of hours yesterday shooting a Gen 4 G19 and it worked flawlessly. I have got to get a G4G17 in my hands. If it works as well and shoots as sweet as the G4G19 did then I might just take the plunge!