FDL-2 Short Stack

This is the caliburn katana magwell mushed together with the FDL-2 magwell until I had something working.

https://gfycat.com/AlienatedUniformIvorybackedwoodswallow
https://gfycat.com/DependentVillainousFruitbat

This is an early release, and currently has the following issues/requirements
- Has a bit awkward mag release
- Doesn't yet have covers for the race way
- Requires manually widening the holes for the magrelease. I used 1/8 and 9/64 bit for the magwell mag release holes, and the hole in the mag release itself, respectively.
- A long 6-32 screw was used to hold the magrelease in place.
- A hole was drilled near the top of the mag release to add a screw which holds a spring in place. There is currently no hole in the mag release model.
- There is no magwell top insert yet. That's trivial to make and I should get to it in a day or two.
- The fdl grip with the battery wires does not screw into the magwell, it's blocked by the mag release design. This doesn't seem li