Safariland mag holders work great - Safariland 773 Adjustable Magazine Pouch - Tactical Black, Right Hand 773-53-121-150

I shoot in practical pistol competitions and these mag holders work flawlessly and hold the magazines securely whether running or going prone. The adjustments are easy and allow you to set the tension to fit your style.
Pros: Easy to install, easy to use with adjustable cant and tension
Cons: None

This review was written in the old system and had content requirements that are different than reviews written today.