Hi Everardo, Ruger 321 2.25" Barrel vs Ruger 340 4" barrel

the 340 is the SR9E which is a budget SR9 The most obvious change is the slide serrations. The 9E has wider cuts requiring less machine time. Second up is the sights. The 9E uses smaller dovetails (again, less machine time). On the subtle side, the slides are only available as a matte “Black Oxide” finish instead of the more robust (and expensive) semi-gloss Black Nitride finish. Finally, Ruger no longer has a loaded chamber indicator, now opting for a small visual-inspection port. To hit cost targets, Ruger further removes small accessories and a magazine (the 9E only includes one). The loading tool is gone and the pistol does not ship in a hard plastic case, instead using cardboard. thefirearmblog.com/blog/2014/06/30/new-ruger-9e-low-cost-ruger-sr9/

The SR9E is a slightly down graded version of the SR9 Everado to make it more affordable to compete with the hot compact 9mm lower cost pistol market.

the 340 is the SR9E which is a budget SR9 The most obvious change is the slide serrations. The 9E has wider cuts requiring less machine time. Second up is the sights. The 9E uses smaller dovetails (again, less machine time). On the subtle side, the slides are only available as a matte “Black Oxide” finish instead of the more robust (and expensive) semi-gloss Black Nitride finish. Finally, Ruger no longer has a loaded chamber indicator, now opting for a small visual-inspection port. To hit cost targets, Ruger further removes small accessories and a magazine (the 9E only includes one). The loading tool is gone and the pistol does not ship in a hard plastic case, instead using cardboard. thefirearmblog.com/blog/2014/06/30/new-ruger-9e-low-cost-ruger-sr9/