Micro Fight Chassis MK 3

Height 5.00
Width 9.00
Depth 1.00
Color None Selected Required

*** 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 18 ratings)
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Fully Modular
Written by Brandt on Feb 17th 2018

Being someone who is not MIL/LEO, take what i have to say with a grain of salt, with that being said; I am someone who understands materials and understands what quality is when it comes to components and materials used in production of items used for hard and lasting use. The MK3(III) chassis is of high construction quality and the stitch work is very accurate and precise with the angles and surface area of the materials used in the overall construction. The velcro both hook and loop are very tight in weave and they seem to have been sourced from a good manufactuer of H/L product. They appear to be able to have many rips and pull life in them without straightening out over extended use or time use, which can happen with lower end quality H/L products. The plastic buckles provided with the MK3(III) are of a good mold and are molded with good "plastic-polymer" material that can withstand very low/freezing temperatures and also withstand very hot and humid temperatures. they are an un-smoothed and low-coarse in nature (much like a p-mag) that will allow great grip retention if the user had to unbuckle or re-buckle need be. I believe that the buckles really fi the nature of the product and add another point to the reasoning of "modularity" because it can be used in a vast and wide range of environments. The overall package and size of the MK3(III) is user configurable and can be set up with other items sold by Spiritus Systems but as it stands alone it is small enough to be low-vis under a coat or jacket, but still large enough to be used as an "assault" rig or a recon* rig. As a civilian with Life, Liberty, and Independence in mind, this system makes me feel very lightweight as well as being fully prepared for any situation. 5/5 for an overall rating for the MK3(III) Chassis in all aspects: 1.Construction 2.Modularity and 3.Comfort(does it irritate the skin/user etc)

Full Feature Adapatable Rig
Written by Colby on Feb 11th 2018

The simplicity and modularity of this system(Chassis, Fat Straps, Back Strap, Inserts, Full and Half Flaps, Expander Wings, and SACK) is incredible. I purchased the Chassis, Inserts, and Flaps in Multicam Alpine initially as a placard set up for field problems in the north. Shortly after receiving the initial set up I purchased the Fat Staps, Back Strap, Expander Wings, and SACK. When we don over whites I detach the placard, attach the Fat Staps and Back Strap and wear the rig over my over whites. Scaling and tailoring the rig to mission sets and positions is quick and easy and the rig seems to be well constructed out of quality materials. Regarding the Rigs’s performace/capacity. The adaptability of the rig makes it easy for me to carryeverythi g from my 148/152s, IZLID, map/imagery, LRF, strobe, GPS, chemlights, IFAK and 3-5 magazines over over whites as requirements dictate or just wear the chassis as a 3 magazine placard.

Item received !
Written by Pilotelle on Feb 7th 2018


Written by Rory S. on Jan 26th 2018

I absolutely love this chest rig. It's the right size for a smaller low profile system. Has top tier quality in the stitching, materials and overall craftsmanship. Easy to set up to your preferred way. I bought this product because I saw many uses for it, ranging from hiking to defensive/offensive operations. Keep up the awesome work! 10/10

Micro Fight Chassis MK3
Written by Garrett S on Jan 23rd 2018

The quality and expandability of this system is exactly what I was looking for in a chest rig system. It fits perfect, doesn't move when using it and puts your equipment at the perfect level for quick deployment. I would highly recommend this to anyone who is looking for a fighting system.

very happy
Written by Vinny Fulgieri on Jan 20th 2018

so this probably is one of the best rigs you're going to find out there for the sole reason of adaptability. you're not locked in to anything with this set up. set it up how youd like and drop it in to any plate carrier or run it solely as a chest rig its awesome. DO NOT HESITATE TO BUY THIS

Written by Mark W. on Dec 22nd 2017

Received my rig (and all the other components) last week and put it all together. I'm extremely satisfied with the quality and function of everything. I have my rig set up with the triple AR mag pouch, and the double pistol mag and half flap. The versatility of their design is an absolute game changer. I went out to the range the other day and this rig fits so well and it so low profile at times I forgot I even had it on. For anybody looking chest rig, look no further, this it it.

MK3 Rig
Written by Charles on Dec 14th 2017

Now that I have my rig I love it, fits great, and I love that it's in the Woodland pattern.

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.