Quote Originally Posted by ST911 View Post
gen5 includes several tweaks that make it the most advanced Glock yet. If you're buying new, get a 5. If you have older versions that are meeting your needs you may or may not benefit from upgrading depending on your needs and what you're capable of. For example, if you can't hit a standard sheet of paper at 25yds the GMB isn't going to do anything for you yet.

The GMB and trigger attributes are commonly mentioned as reasons to upgrade to a 5. Others may suggest just upgrading older models with a new barrel or trigger kit. That is indeed an option, but those modifications can compromise reliability and quality options approach or exceed the costs to upgrade. Along with time/ammo to vet the gun.
Some great feedback overall. Very helpful. Thanks ST and everyone