My one and only glock is a 23. It's mostly stock except for the LaserMax. I have 5 13 round drop free clips for it.
I have several ways to carry it, including a fanny pack (which I use only when I can't use anything else), a glock plastic beltslide holster (which I hate and never use), a leather beltslide holster (which I love; I'm not sure of the brand, but it says "Made in South Africa"), and a Sabra brand nylon IWB holster (from Israel; which if I can find the Israeli guy who sold it to me I'll buy a few more).
I usually only carry it with one mag full of Cor-Bons, unchambered. I figure if I can't get the job done with 13 rounds, another 26 won't do me much good.