What I am finding is that if you leave the mags in the holder, the bungie stretches a bit and makes them a bit looser. You can adjust the bungie almost all the way to give the cord maximum length. Before you do that, try coating the interior of the mag holder with some silicone treatment like MeGuires vinyl and rubber protectant or some type of car interior protectant. i just did it with mine and and the retention is good but the draw a lot nicer.
I ended up doing some training with these mag holders and found them to be pretty darn good. I made the decision to 86 my plate carrier (I don't own any plates, I just use it for carrying gear) and have decided to go with a battle belt instead. These mag holders work really well for that purpose.
It's also worth pointing out that I recently made the switch to all HSGI Taco Mag Holders for everything else I run. I chose to stick with these IDOGEAR mag holders for the CZ mags because the HSGI stuff doesn't seem to be the right dimension. Their pistol Taco Mag Holders are too small and their sub gun tall Taco Mag Holders are too tall; only about an inch or two (not nearly enough to grab in a hurry) stuck out past the top of the mag holder.
