As far as cleaning goes...  unless you have some serious problems or major crud building up in the magazine gate, I would avoid disassembly beyond removing the stock, bolt, side plate, and disassembling the bolt.  I have been shooting my Krags for a few decades, and have never disassembled beyond removing and disassembling the bolt and scrubbing the bore... and I've never had a problem!  IMHO, it's just not necessary!

Paul