Lightweight Kimber Build with Custom Carbon Fiber Stock

[CoMtnMike]

I’d definitely defer to @Gobber here, as I’ve only done two so far and completely guessed on the thicknesses. But, I would suggest going with multiple layers of 3k. The thinner fabric will conform much better to those complex curves with simple methods (but if you have a full vacuum bag setup that should do 3k and 12k equally as well). I think there are areas in my ultralight Kimber where there are only 2 layers of 3k, but areas like the wrist have more. A good core with one or two layers of thin 3k carbon that was laid and conformed well is incredibly rigid. My learning curve is a bit slower, so around the complex curves in the wrist/grip area I can feel that the first few layers didn’t pull perfectly to the core or the previous layer, and another layer or two is required.

I would say for the first time only try do do one layer of carbon at a time, and you’ll learn how it pulls, bends, and dries pretty quickly. Then just add layers until you are happy with how rigid it feels.

And remember that if you are going for a good to perfect surface finish, you will definitely sand through some of the carbon, especially with the thinner stuff. But therin lies the beauty of carbon fiber - you can just add more!

Keep us updated and don’t hesitate if you have more questions!

@RepeatPete this is amazing and I have read through it and your earlier build 2 or 3 times now in awe. I think I have convinced myself to give it a try if I can find a used take off stock for my Ruger American at a reasonable price for the donor action inlet section to build off of. I'm curious if you or @Gobber would have thoughts on just shaping in foam vs maybe a 3d print shell to design the grip + butt stock section just to get the negative comb and toe angles correct, consistent shape and symmetry... My shaping and carving skills are rough... 3d printing a shell, filling with expanding foam and then covering with carbon fiber would definitely be heavier of course but my prime objective would the rokstock or mountain tracker lr ergos first and any savings in weight over the factory stock would be bonus...