I have never seen a K31 at any of the LGS that I go to regularly. I am going to the Oaks gun show at the end of the month but I expect it to be much like the Charlotte show with prices severely inflated. That leaves me gunbroker to find one. Had fair luck in the past buying a M95 and Hungarian MN. Now that I am looking at K31's what should I be looking for? How many manufacturers are there? Is one manufacturer more desirable or valuable than another? What years are most desirable? Other than numbers matching and condition is there anything specific I should be aware of?