The two 340's I have owned, had checkering and high gloss. Jim, I suspect this is a plain model? or do you suppose it's been refinished?
I had a 222-D and a 223-E, the 222 had a horrible trigger pull and the 223 had a pretty nice one. I attempted to swap the trigger parts on the two rifles, but being a different series, they had a bit of a different shape. all the important parts lined up, so I was able to swap them, but the trigger was positioned differently on each, one far forward and the other far back...they both functioned, but I could barely get my finger in the 'far forward" one. SO I swapped the parts back.