How can i get Diana 34 airgun?

Are you looking for a gun or rifle? ( You said airgun not rifle.) The Diana model 34 has be produced three different times over the years. Here are the years, 1928 -1940, again in 1984 and started production again in 2014. You can also find Diana marketed under the RWS brand. (Diana has a very complicated history). Unmarex air guns imports Diana models currently. I suggest you google Umarex-USA and contact them.