First you need a correct time-frame 91-30 Mosin-Nagant in the proper "high wall" receiver configuration.
You're in luck: there's such an offer in the EE military surplus forum
http://www.canadiangunnutz.com/forum/showthread.php?t=207794
PP.
Anybody have a link/pics of a high wall vs. low wall receiver. I can't tell which I have (new at this) I have a slight dip on mine, does this sound like a high or low wall receiver?



























