I have a Glock 21 that currently is on my "woods gun" duty. After some close incounters of both the yogi and kitty kind, I wouldn't mind having more power then the 45 acp.aranoid: From what I have gathered on the interweb, I can put a 24lb recoil spring and aftermarket barrel and run 45 super. On the other hand I can buy a conversion slide and barrel to run 10mm. Ammo availability is not much an issue as I will be loading it myself for the most part. What are your thoughts?