I have tacos for pistol mags and rifle and a couple of the rifle/pistol combo. HSG makes incredible stuff. Holds mags very very well and molle attachment is bulletproof. Highly recommend. Expensive but worth it.
Got my Double Decker Taco today and it is top quality. It seems a little snug for the pistol mag, so I will have to figure out how to loosen it up a bit. It will be interesting how big of a profile it makes with two mags or a cell phone and a pistol mag in it.