All of my CZ rifles are rigged up with factory folders and I'm in the process of para-cord wrapping them all. When done properly the wrapping stays on nice and tight, plus you will have the ability to easily tighten it as required (have not had any need to do it yet...but nice to know it would be easy if required). The i-beam shape of the stock lends itself nicely to lashing on the paracord not unlike how you would lash a free rope end with whipping twine. Basically you lay a loop down in the interior of the stock channel and then wrap tightly around the loop all the way down the stock. When you get to the end you pass the free end of the cord through the bight and then pull on the other end to tighten the bight around the free end. If you pull hard enough you can suck the bight and the whipped end right into the i-channel.
See the following link...example #2 is the closest to what I use.
http://www.ropeworks.biz/reader/whipping.pdf
Cheers,
Brobee