This is the new PICO DS Chest RACK from TYR Tactical. It was designed specifically for use with their PICO DS but it can also be run independently with an H Harness. An interesting feature is that each of the four individual magazine pockets at the rear are actually Combat Adjustable Happy Mag Pouches. For those who want extra security for their magazines, they’ve included optional bungees.
Additionally, it also capacity for two pistol mags (pouch is magnetic) and two GP Pouches, one of which will hold an M67 and the other is a bit larger at 4″x5″ for med/signal/SERE needs.
The spacer mesh at the rear is removable and the RACK can be attached via Velcro. However, the SR four buckles hold it in place pretty well.