Sierra Hotel, dude 8)
You'll love this thing! I love mine and I know Primal's been drooling over these for quite some time. I'm not planning on doing anything to mine cosmetically - those dings and dents tell a story in my eyes.
If you haven't been there already, I'd suggest going on over to
http://swissrifles.com/ and
http://surplusrifle.com/ (scroll down and click on the K31 link on the left). If you can find surplus GP11 it's berdan primed and steel jacketed, but it's brass cased, non-corrosive, and match grade. That's right - these rifles have never known corrosive ammo

I usually go to one of the gun stores in town that carries Wolf Gold in 7.5x55 Swiss - match grade, new production, brass cased, non magnetic, and boxer primed!
If you want to scope it, I'd recommend something like the mount here:
http://surplusrifle.com/reviews2006/stmariescopebaseswiss/index.asp
A couple of words about the magazine - treat it with as much care as possible. These are serial numbered to the gun and soldiers were not supposed to have more than one. They also weren't supposed to be removed to be loaded. You won't find separate surplus magazines or mag springs and the aftermarket extras are about $60.00 and from what I've read not all that good. If you want to have a bit of fun and add some old time authenticity, you can get some of the K31 chargers - I got mine here:
http://charitycoinshop.stores.yahoo.net/orisswkristc.html You use them through the top of the rifle like a stripper clip to load the magazine while it's in the rifle. You should've see the faces on the counter guys at the shooting range (indoor) when I showed up with those
I don't know about you, but I like bayonets. I have one for each of my Mosins, one for my AK-47, and one for my Steyr M95. The K31 will have to go without for a while - the bayonets are around $100.
I do think I need a sling...
Have fun with that K31 :devilsidesmile: