I know I know…this isn’t an AR. But it now has some AR parts… 
I bought this CX4 back in '09 right after a friend of mine passed away from a bad motorcycle accident. Needed something to kinda cheer me up.
I found this CX4 locally with 2 20rd and 2 17rd mags and a Tango stubby for $695. After seeing alot of mods done to them I knew I’d be doing some to mine. I ran into a CX4 picture of one which had an M4 stock attached. Here’s my inspiration.
I knew after someone else doing it that I could with a little planning.
I couldn’t find out who did it to pick their brain so I strapped on my c.o.jones and cut the stock off.
I filled in the back of the lower assembly with epoxy to make a place to drill out for the stock tube. It’s a milspec 6pos BTW from palmetto. VLTOR modstock from BCM for $50.
Filling it with epoxy allowed it to harden quickly while making an extremely strong plate to mount a stock tube.
After drilling it out with a spade bit I checked the fit and it was tight enough to hold but not too tight that it was impossible to install the tube into. The threads actually grabbed to the epoxy/polymer and it did sort of thread in so that was good. I mixed more epoxy and installed it as far as it would go. I think I drilled between 5/8" and 3/4" into the CX4’s lower assembly so the epoxy has plenty of surface to grab to the receiver extension.
I then sprayed the VLTOR stock in tan, applied pine branches over it with earth brown, black, and forest green. Voila.
After the paint dried in the sun—about 30mins—put her together.
Range report soon. I think it needs a pad on the end—not a fan of the cheese grater on the end as my other ARs have SOPMOD stocks…but this was 1/4 the price so I decided it’s worth it.
Comments welcome!