Nice review, I know someone with one of the early ones with the green furniture and had a go on it, had a Ta31 Acog instead of the Susat fitted and a 30 round mag, with the bottom portion of the mag that stuck out of the magwell sprayed with black paint so you couldn't see the rounds! Bit odd!
I've no idea how he modded it, but he seemed to have tapped and drilled a hole in the barrel quick release slot and put a hex head bolt in there, and voila, quick release barrel. Saw him remove and refit it as he showed it to me to demonstrate it.
I found it nice and easy to use though I thought the trigger was very heavy. Don't know if it helps you, but he stuck an AR15 A2 style flash hider on it so it looks a bit more military looking if that's your thing. Would have one myself if I had another slot spare.