I'm fairly new to Glocks and ever since I purchased my G19 I absolutely fell in love! I chose .9mm for different reasons but lately I have been contemplating on a bigger caliber such as .40. After reading about changing barrels and that the G19 and G23 are compatible, I've decided why buy a whole different gun when I can just change the barrel. The day I came across that info, I failed to read it in details amd just now realized that is something I'm looking to do if possible. My question is the following: Is my previous statement true about the G19 & G23 being compatible? If so, where would be the cheapest place to look for a barrel of that caliber? ( .40 ) I figured I can shoot the cheap .9mm ammo and still be able to carry a stronger round if needed. Thanks in advance guys!!! Shoot Straight!