WHAT DOES HOW DO I BUY A GOCK 30 GEN 4 ONLINE MEAN?

I am undecided when there is A great deal I can do to enhance on it but, if there is I want some Tips from those of you that have modified their pocket tanks. Besides night time sights that is an clear up grade from the regular glock sights. Thanks beforehand.Of course there's the KKM 10mm conversion barrel and the right mags. It truly is an amazin