The following weapons were used in the film Shining Through:
Walther P38Several German officers carry a Walther P38 in their holsters. At the end of the film, Ed Leland (Michael Douglas) uses a Walther P38 to kill a German officer and a German soldier when he runs towards the German border (he manages to fire 15 shots from his 8-shot Walther).
The MP40 is very briefly seen by some German soldiers, and is not as common in the film as the Mauser K98K.
Swedish M1896 Mauser
M1896 Swedish Mausers are the most common German infantry weapon in the film, which is inaccurate - At the time, the German military would have been using the Mauser Karabiner 98k as their service rifle, not a Swedish Mauser. A German soldier uses a Mauser rifle to wound Leland in the knee and the shoulder at the end of the movie when he struggles to get to the Swiss-German border.
The straight-pull bolt action K31 Rifle is used by the Swiss border guards, notably at the end of the film when one justifiably shoots a German soldier with a K31 after he crosses over into Switzerland. This is actually an accurate weapon as the K31 was the standard-issue service rifle of the Swiss military at the time.