I did this to my socom 18 and it was pretty simple. I just bubba'd it up by drilling some holes in the stock and running some small hex bolts with lock nuts on the other side. There was plenty of clearance from the barrel and it worked good.

I just found a section of rail with hex screws and backing plates that I had used on my AR...completely forgot I had it
So, to install it, I'm guessing that the rivets holding the swivel in place need to be drilled out, then new holes drilled for the rail screws.
if you dont want to drill new hole into the stoc, treelinem14 sells sadlak railed replacements for the existing holes




























