how to get ffl

So I bought this, and its on the way to the FFL. I need to figure out how to get some kind of cheek riser on that ACE stock, or some other replacement. It has an AR buffer tube adapter installed.
Any suggestions? I'm considering just using one of those strap on stock accessory things with a built in cheek rest to add some height but I think that might look silly.
Zastava M77 .308