I've scoped mine.
St. Marie's Graphics (Pierre from the Swiss Rifles Forums) makes an excellent set of mounts, both clamp on (right eye-offset) and drill and tap (left eye offset). Brownells carries both.
I don't like long eye relief scopes much, myself so the receiver mount appealled to me.
I restored a very beat up and mismatched early pre-68 import K-31 and decided to use the drill and tap mount on mine. Normally I don't alter my C&R guns, but this one was really sad and I have good matching examples too so I thought what the hell. The mount goes on the right side of the reciever, and still allows clean ejection and stripper loading. It offsets to the left, like a GarandD, which takes some getting used to but it's actually very instinctive once you get used to it.
I mounted a Meiji 9x32 euro sniper scope on it, and have tuned the trigger a bit but otherwise the rifle is as stock. Even so, with handloads it'll shoot sub MOA with ease and with GP-11 you can hit clays at 100 yards until you're sick of busting them. Very nice setup.
The clamp on mount he sells is a right-eye offset, and is probably better for most people but it's also more expensive and that's alot of why I didn't go for it.
Here's pics of the mount: