The lack of aftermarket stock options is the primary limitation of the kimber 84m rifles. I've been working on a 3D Printed chassis for my kimber rifles. Features I wanted that I don't get with the factory stock:
1. pistol grip with close trigger reach
2. Arca rail
3. Detachable or folding stock (so that my rifle can quickly be made small enough to fit inside my pack when in the field)
4. Negative comb cheek riser set to my proper height (or be adjustable)
5. Rigid design that can be easily bedded
6. Fully free-floated barrel channel
7. Compatible with AICS style mags
8. Relatively lightweight
I've come up with a couple designs. My custom 18 inch 22CM 84m was permanently bedded into a carbon-fiber tube stock with a 3D printed trigger well and grip mount. Bare rifle weighs about 3.75lbs (attached pic of the groups it shoots at 400 yards).
The other version is going on my 6.5cm Hunter 84m that was cut down to 18 inches and threaded. It is fully 3D Printed except for the removable stock portion. Bare rifle is about 4.5lbs, which is about as lightweight as I want a 6.5CM... and the fully setup rifle is just under 8lbs including a trijicon credo 2.5-15x42, dnz 1 piece rings, scope caps, custom tripod, ball head, and a 9 inch Jolene Suppressor, 3rd mdt magazine, and 4 loaded rounds.
Also attached for comparison are pics of an unmodified kimber hunter stock and modified hunter stocks.
This 3D printed stock setup weighs about 23 ounces right now (it could easily be printed several ounces lighter without compromising strength/rigidity). My "full featured" modified kimber stock was about 22oz. The lightest modified kimber stock I've seen was about 16oz including mag... but it lacks a lot of features that make an ultralight rifle shootable IMO...
I'll also add... I was considering rebarreling this to a 6CM, but when I realized I could get 2700-2750fps with a 140eld and RL16 in this 18 inch factory barrel, and still be under book max, I decided to stick with the 6.5CM. That gets me to 775 yards before the bullet drops below 2000fps, and to 970 yards before it drops below 1800fps. By comparison, my custom 6mmCM built on a rem700 clone action gets to about 2880fps with a 108eld and N555, which puts me to about 680 yards before it drops below 2000fps.
I can get to 2.86" OAL with the MDT mags. Limitation is the location of the feed ramp, not the mag.