automatic firearm ,
automatic gun
automatic weapon

As a result, the 37 mm (1.46 in) T9 automatic gun was developed.

Gas tanks are so expensive though for automatic guns.

They carried automatic guns and, as we were led up the hill, both units started shooting us.

"The Germans must have a lot of automatic guns," he commented.

Also, rather than using a larger 75mm to 100mm main gun, it uses a smaller, fully automatic 23mm gun.

In addition she was armed with three smaller, automatic guns for self defence.

But it was just an automatic gun still actuating itself in a repeating pattern.

An automatic gun, documents, and ammunition were seized by the government forces.

They carried various types of weapons and even automatic guns.

There was a sudden racket outside, punctuated by the sound of automatic guns.