Might have been a fluke but I went to the RK show at the Wichita Cessna center early last year and there was a private dealer with a pile of WW2 rifles. He said he was selling out his collection. Had a bunch of Mausers and several G43s. I ended up buying a spotless Czeck mauser from him. Cleanest one I have ever seen.
That being said. I am finding lately that the deals are drying up and prices have been getting a little crazy at the shows. I actually decided not to go to any this year, as the last couple have been a waste of time.
Can't speak to your question, OP, but wanted to mention:
There is a gun show this weekend in Wichita at the Coliseum! Hadn't really heard a peep about it until two days ago. Usually there seems to be more advertising.
Thats the one I'm going to. Wife has some things to do in the area so I'll be at the gun show.
The classic stuff is hit and miss. You'd be better off trying to find a private seller there. A lot of the dealers there deal with new stuff (like us). Every once and a while, a dealer will show up with a case of Nagants.
If there's anything new you are looking for' mention this post and you'll get the "AR15.com Discount"!
Unfortunately, most of the "German WW2" stuff I've seen at the gun shows in Kansas lately have been fakes, repro's made for reenactors.
That said, memorial day weekend at the KCI Expo Center is the new weekend for the KC Militaria show this year.