3rd frames shorter rails

good question, i noticed that the rails sure seemed smaller than i thought they were gonna be!

 

maybe less friction?

 

Also, I noticed from the photo that the gun on the left has a bent-style ejector like my 3rd gen G30, while the one on the right (I assume pre-third gen) has a straight ejector.
The bent ejector hits the primers on my gun. This may be why lower powered ammo tends to eject empties directly upwards instead of to the right.
Now I'm wondering whether I should bend my ejector to a more straight configuration.

 

Are they the same caliber? I know that the 9mm ejectors are bent and the .40/.357 are straight.

 

The ejector on the left is a normal 9mm ejector. The one on the right is a normal .40/.357Sig ejector. They do not interchange.

 

My second gen have longer rails than my third gen and they are machined not plated like the third gen. One would think the longer rails would last longer but who knows why they made them smaller. The 3rd gen plating surface seems to come off before 1000 rounds then the wear seems to stabilize. The 2nd gen even after 50K rounds looks like it did when new.