I like the K31 over the 2.
Both are equally priced depending on quality of rifle.
There are a abundant supply of the M/N out there and plenty of ammo.
The k31's seem to be drying up,from what I've seen of the various distributors the prices are going down on the K31's.I'd venture to say with the drop of quality the prices come down.So theyre going quick.Ammo is out there, there are several people out there that sells it and reloading info is out there also.So its more expensive to buy,but it wont ever disappear.
The K31 is more accurate from what I've experienced off-hand and on a rest.Perhaps its the quality ammo,I dont reload yet but the GP11 ammo is accurate.I think I bought 3 bricks of 180 rounds for $72.The brass and bullets are available.So the reloaders can assemble it cheaper.
For the price get the K31,enjoy it.Sell it to a friend if it doesnt meet your needs.Then go after the M/N.
I have both, shoot the K31 more than the M/N.I shoot with a shoulder pad so felt recoil is minimal from both.
Good luck and enjoy the nostaliga.