The Model 34 was a take down bolt action single shot made 1934-1935
The model 340K was a hammerless bolt action repeater made 1958-1971
The model 340 M was the same gun with a Manlicher stock
I believe the KC stands for the K model with a clip. Midway or Wisners should have a clip for it. Probably worth between 100 and 175 bucks. Hope that helps