Spiritus Systems Micro Fight Chassis Mk4

Micro Fight Chassis Mk4 – Ultra-Modular Chest Rig Platform

The Micro Fight Chassis Mk4 from Spiritus Systems is a lightweight, modular, and mission-adaptable chest rig chassis designed for maximum efficiency in compact form. Whether you’re running low-vis ops or full-kit operations, the Mk4 adapts to your needs with unparalleled versatility.

Key Features:

• Modular Interior Configuration

  • Soft loop fields in both compartments for custom magazine and gear insert setups

  • Compatible with 5.56×45, 7.62×51, submachine gun, and pistol magazine inserts

• Expanded Hook Field (5” x 9”)

  • Integrates seamlessly with Sub Abdominal Pouches, Expander Wings, and other Spiritus accessories

  • Works as a chest rig or as a placard for plate carriers like the LV-119

• Mission-Focused Versatility

  • Compatible with rifle & pistol mags, flash-bangs, 37/40mm grenades, multitools, IFAK items, breaching tools, and more

  • Grommet ports allow direct Tourniquet mounting using the Spiritus Universal Retention Kit

• Placard-Ready Integration

  • Transforms into a plate carrier placard—remove side buckles and attach via rear hook field

  • Adjust your kit profile on the fly, from streamlined chest rig to full carrier loadout

• Lightweight Yet Capable

  • Ideal for both overt and covert missions

  • Minimalist profile, low printing under garments, and expandable capacity

One rig. Infinite loadouts. The Micro Fight Mk4 is your adaptable solution for any operational environment—ready to scale up or down as the mission demands.