The viper special operations chest rig has built-in adjustable mag sleeves with three utility pouches on the front. It also features one adjustable utility/mag pouch, one adjustable GPS radio pouch, and an adjustable double pistol mag pouch.
The Rig is able to hold a lot in a small design as all the pouches can be adjusted to fit the type of mags you are using.
You can wear this over other layers such as jackets/smocks without hindrance. This allows for better maneuverability in confined environments. It can be adapted to fit your size using the adjustable shoulder, underarm, and waist webbing straps. Quick-release buckles let you remove the rig quickly.