I thought it might be informative to share the progression of my competition belt setup. I've been shooting USPSA Production division for just under a year. I dove right in, having no experience at all, the week of my first match. With little time to pick-and-choose gear, I was at the mercy of what I could get via Amazon Prime before the event.
First was the belt. I chose to start with the Blade-Tech Competition Gun Belt. It was available in the size I needed and with Prime, would be here in two days. I then went with four Safariland 773 Competition Single Magazine Holders for my mags. I've actually kept these for now. Although I began with them mounted using their included mounts, I've since switched to Safariland ELS Kits. I should also add that I dumped the Blade-Tech belt about mid-season in favor of a R.J. Holsters belt, which I then used a wood burned to melt holes in to accept the female ELS mounts. This setup provided the smallest footprint, allowing more hook and loop on the outer belt to make contact with that o the inner belt. Minimal.
At the time I started I was shooting with an MK25. Production legal holsters for the p226 are hard enough to find, but I was dealing with the pic-rail of the MK25 on top of that. I ended up searching the shit out of paddle holsters that I could modify and hit a home run with Uncle Mike's Tactical Kydex Open Top Hip Holster with Paddle. I was able to modify that to fit a Blade Tech Drop and Offset Holster Attachment with Tek Lok with relative ease. And although the Uncle Mike's holster was made for the p226 R, it fit the MK25 perfectly.
I've since switched to a Sig p226 Extreme.