The rifle the gangsters are using is a German Gewehr 43, also known as a G43 or a Gew 43. It is semi-automatic and fires an 8mm cartridge. It is well-suited for the task they are undertaking. See more

Goofs

Unless the water on the floor had a ground wire or leaked to a radiator, etc, the table and rifle would have 5,000 VAC but not ground to connect a circuit. So He would not feel anything. And if it did, his muscles would freeze up and not make him pull the trigger repeatably. See more