Multi-Platform Radio Chassis Mk5 The Multi-Platform Radio Chassis (MPRC) Mk5 is a modular and scalable approach to radio retention that can accommodate a wide range of radio models. The chassis is a three-part system that allows the internal dimensions of the MPRC to expand and contract as needed. With this wide fitment range, almost any radio model can be properly secured and ventilated while maintaining the full range of functions on the handset. The chassis backer is a semi-rigid board that can be mounted to body armor, chest rigs, and packs using its two MOLLE columns, or on the waist via the integrated belt pass-through. The board is stiff enough to provide a firm mounting Mfg: Spiritus Systems