With police dropping them the market is becoming saturated. I've been told that glock will not be making gen 4 40 pistols because majority of the guns returned are 40 and the high pressure the 40 has is causing stress on the guns.
I am in the market for a glock 23. I really only need a frame, but having a 357 sig barrel is intriguing to me.
I have a Glock 32, which is basically a Glock 23 with a .357 Sig barrel.
.357 Sig is a great round.
Underwood makes some good loads in the 125 grain HP @ 1475fps ballpark.