Best used as shooters in military form, sporterizing them is difficult, changing to US calibres a big problem because barrel breech form is intricate and few smiths know how to do it. Larry Racine, at LPR, makes a sleeve out of the issue barrel, threads the inside and screws a .308 barrel into it. But he specializes in target rifles. There were a few K31s made as fine sporters by some of the Swiss firms, I think including Hammerli and Emig & Grumiger (not sure of the spelling and definitely not sure of the pronunciation) but I have never seen one for sale in the US. Most were 7.5 Swiss but I have heard of .30'06, 8x57, etc. There are three really fine European Schmidt Rubin sporters in odd calibres for sale November 23 at Bonhams's San Francisco, lots 5792, 5793, 5794, engraved, fancy wood, etc., but they are primitive actions compared to the K31.
