I have a Glock 35 for sale that I used mainly for IDPA. Most of the rounds shot through it have been with the KKM barrel and 9mm parts in it. My guess is around a thousand rounds. With it as stock, it only has a couple of hunderd .40's though it. I went ahead and purchsed a G34 so that I can shoot it at matches.
GLOCK 35 - with two mags and everything stock $525
KKM .40 - 9mm conversion barrel and internal parts $150
409-781-0568