Micro Fight Chassis MK 3

Height 5.00
Width 9.00
Depth 1.00
Color None Selected

*** MK3 Chassis require the updated Rifle Insert Mk3 for proper operation. All other previous generation components are cross compatible. ***



The NEW Micro Fight Chest Rig Mk3 is designed to be extremely efficient, modular, and lightweight. The Micro Fight works seamlessly with our accessories suite which offers nearly endless configurations. The addition of soft loop Velcro in both pockets enable you to put mission essential items where you want them based on your individual needs. The improved profile allows for the use of six 5.56 x 45 style magazines or four 7.62 x 51 magazines or any combination of rifle and pistol magazines. The 4” x 9” field of hard loop Velcro on the back of the rig allows for solid integration with accessories such as the S.A.C.K. pouch or after market plate carriers. Just like the Micro Fight Chest Rig Mk2, the Mk3 is designed to scale from low visibility to high profile at a moment's notice.


Unmatched Versatility  

The Micro Fight Chest Rig sports a host of accessories like no other system. The user can select from any of our accessories to meet operational requirements. The platform is lightweight and small while still allowing you to carry multiple types of munitions and equipment. Examples include rifle and pistol Magazines, 37/40mm grenades, flash-bangs, multi-tools, flashlights, medical supplies, and breaching equipment.

Stand Alone System

The Micro Fight Chest Rig was designed to perform as a stand-alone system. It can be configured for wear in low visibility environments that require minimal printing through clothing with maximum equipment storage. It can also be configured for high visibility operations where a full spectrum of equipment is required.

Placard Configuration

The Micro Fight Chest Rig was designed to work seamlessly as a "Placard" for plate carrier systems. Simply remove the 1 inch side release buckles and attach the system via the hard loop Velcro located on the back of the system to you plate carrier. This configuration allows for profile expansion or reduction as mission requirements change. 

NOTE: The CHASSIS is part of the Micro Fight Chest Rig System. This item does not include shoulder straps, back strap, half or full flaps, magazine inserts, or any other accessories. Additional components are required for proper use. If running as a stand-alone system, shoulder straps, back strap, magazine inserts, and possibly full or half flaps are needed. If running on a plate carrier, back strap, flap(s), and magazine insert(s) are needed. 

Some images shown with optional accessories, sold separately.

Product Reviews

Score: 5 out of 5 (based on 10 ratings)
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Review for Micro Fight Chassis MK3
Written by Thomas on Dec 2nd 2017

Best low profile chest rig out there hands down.

Written by Ted on Nov 17th 2017

Super low profile. Well made. Only thing is read the description, I didn't read and you need to get the inserts to actually use it. Completely my fault.

High Speed
Written by Hayden on Oct 25th 2017

Bought the Multicam Tropic version and was very impressed. I have several Haley Strategic D3CR’s which are really good rigs to run but this blows them out of the water. The versatility of this platform is second to none, it’s lightweight and allows for ease of movement. I would highly recommend this to anyone

Mk 3 Review
Written by Stash on Aug 13th 2017

I have 2 of these Chassis now. By far my favorite chest rigs and pieces of gear I own. I have gone from a knock-off RRV rig, to a super minimalist hypalon skeleton chest rig with pouches attached, to this. There is no comparison. It's low-profile, yet it can carry whatever I need it to, and more than I should really want to carry on a chest rig in some instances. Changing loadouts is worlds easier and faster than re-threading molle pouches. Rides well, maybe a tad low but I'm on the short side with the fat straps. No purchase ragrets whatsoever.

Awesome Chest Rig!
Written by Mathew Vnuk on Aug 7th 2017

If you're looking for affordable and quality gear I'd highly recommend Spiritus Systems Micro Fight Rig! It's meticulously built and designed, it's versatility is also top notch. No matter your load out you'll be able to carry all the necessities with ease of movement and accessibility. As compared to other companies, they can't match this Rig as most are built to carry specific load outs without the ability to swap out for other gear. With a few minutes you can completely create multiple variations of this rig to suit your needs. No mission is ever the same, make sure your gear is ready to adapt.

Top Notch
Written by RogueWeasel on May 1st 2017

Best rig I've run yet, access to everything. I need while keeping a low profile. Great job guys.

Written by Scott on Apr 30th 2017

Dope, small, compact, durable, completely customizable, lightweight. This thing is awesome!

The Best. Period.
Written by Ben on Feb 21st 2017

Through my business in the firearms industry I get to handle a lot of nylon gear (Chest rigs, belts, pouches, plate carriers, etc.) and the Micro Fight is one of the best nylon products to spend your hard earned money on. The Micro Fight Rig is just such a simple well thought out design. The endless modularity and load out options are really quite incredible for how small it is. The craftsmanship takes the design into the hall of fame in my opinion. If your a serious shooter, LEO, and/or Mil I would highly recommend this piece of kit. -Ben Wise Men Company

Review of Micro Chest Rig
Written by Justin Wilbur on Jan 3rd 2017

I'll just review the whole rig. Considering I bought all of the Spiritus. I love the simplicity and ease of the system. Great rig and amazingly versatile.

Quality product that offers lots of flexibility
Written by McKay on Nov 17th 2016

I wanted a chestrig that I could reconfigure depending on what I'm doing and what I want to carry. The short answer is this does exactly what I wanted it to, and I'm very impressed. I bought the Micro fight with the straps and a few of the inserts. This chest rig allows me to carry 3 AR mags, 2 Glock mags, and still has room for my Glock 19, or my rangefinder, or whatever else I decide to carry. I like that I can easily switch things around and carry everything I need for my coyote hunts in a quiet and convenient way too, even though the rig wasn't necessarily designed for that. But that's why I love this rig so much. It allows me control to add or take away from my loadout, and reconfigure it as I please. I was a little uncertain of how well the mags would be retained, but after I've used it, I am not worried about mags accidentally coming loose. My initial impressions of the quality are good. It seems durable and it's very lightweight. As for comfort, carrying weight around is never comfortable, but I don't see any way this rig can be improved in that area. It's as comfortable as I can imagine a chest rig can be. I'd recommend this product to anyone who wants the flexibility to configure their loadout in an assortment of diffferent ways, or anyone looking for a simple and effective way to carry your gear. Also worth noting, my experience with their customer service has been very good. my questions were answered very promptly through direct message on Instagram, and my order was processed and shipped within an hour or two of when I submitted payment.