I'm pretty sure the quad mag pouch isn't IDPA approved, but the single and double pouches definitely are. I used the doubles along with a straight drop holster for my Glock for the first time in IPSC last Sunday and they worked great!
GOP, I have one of those and it fits the mags for my XD-40SC just great, but not the 13rd XD-45ACP mags. I looked on the same site earlier this evening and I didn't see an XD-45 on the size selector. I wonder if I could loosen the screws enough so the one I have would work with the larger mags, without it falling apart? Maybe I could find longer screws and make it work. Thanks for the response!