They don't let you fire too many weapons in the German military.
I shot 9mm Heckler & Koch pistol - that was pretty fun. The standard weapon we had was the G36 (which you can throw in the trash can after slightly hitting the sights). And of course the good ol' MG3. It's a bitch to carry around, but once it's set up, it's a fun toy. Firing with this machine gun and tracer rounds in the dark is like Christmas and New Years eve combined.
The best thing they let you do in the German military without special training is throwing some life hand granades (which is pretty unspectacular). They make "puff" and then you have shrapnel flying all around the place.