Milsurp After Hours

The B&W photos seems to be something captured from the Germans in WWI, I'm guessing.
And the other photo.......my guess is something from the former Soviet sphere of influence.....

All I know is that I'm sure as Hell glad I didn't have to go through basic training packing one of them....

Does anyone know what they are??
Maybe Duncan can put them in his "Guess the weapon" thread........

The first photo is a German T-Gewerhr anti tank rifle.