I would get one of these: Galco holsters; Holsters; Gun holster, pistol holsters, western holsters, shoulder holsters, leather holster and Glock holsters then you will not even need the supertuck when it comes.
Or, you could get the standard cqc from blackhawk. I use this owb holster for IDPA and it is really nice. No active retention like the serpa holsters, which in my opinion is a good thing.
BLACKHAWK Standard CQC Concealment Holster Matte Finish - Blackhawk Tactical Gear at ReactGear.com