Wosport MK4 Chest Rig Expansion Chassis II Utility Pocket — Ranger Green

The MK4 Chest Rig Expansion Chassis II is an expandable side panel designed to increase the carrying capacity of Wosport's MK4 chest rig without adding bulk to the overall loadout. It attaches to the chest rig via rear velcro and integrates the lateral buckles for shoulder strap or flat pack attachment, making it a structural part of the system rather than a simple add-on accessory.

The panel incorporates a pocket on the inner side, against the body, sized to fit a handheld radio such as the PRC-152. This position shields the radio from lateral impacts and keeps it accessible without having to open the main chest rig. The outer side features a MOLLE surface for mounting additional pouches, magazine carriers or other compatible accessories: load-out volume can therefore grow in a modular way, only where and when needed, without adding unnecessary weight to the base setup.

The main trade-off to consider is compatibility: the panel is designed specifically for the Wosport MK4 chest rig, and the velcro attachment system offers quick installation and removal, but the structural integrity of the connection depends on that specific host platform. Users running a chest rig from a different brand or a different generation will not get the same structural fit. For those already operating with the MK4, the chassis turns a compact chest rig into a laterally expanded system without restricting arm movement.

Key points

• The inner pocket, sized for a handheld radio (e.g. PRC-152), keeps the radio protected and reachable without opening the main chest rig.
• The outer MOLLE surface allows accessories to be added only where needed, keeping the lateral profile low when no extra modules are in use.
• The velcro attachment system allows the panel to be mounted and removed quickly, adapting the setup to the mission without tools.
• The integrated lateral buckles manage shoulder straps or flat pack attachment, making the panel a structural element of the chest rig rather than an overlaid component.
• Native Ranger Green colour, with no additional coatings that could alter velcro thickness or grip over time.