Jim,
My experience with Glocks has been they will hang accuracy wise with most any other semi. I have found that how the firearm fits the shooter and shooter skill have much more to do with actual results than mechanical accuracy of the weapon. By that I mean just because it shoots well from a ransom rest or a solid rest on a bench does not mean it will give great results in the field. If I was choosing between a Glock, Sig, H&K, S&W etc... I would consider how it fit me much more than its absolute accuracy potential. In reality they will all show more accuracy potential than most can make use of.
-Z
