automatic firearm ,
automatic gun
automatic weapon

Fully automatic firearms are legal in most states, but have requirements for registration and restriction under federal law.

"How'd you like to fight a battle with this instead of an automatic firearm?"

In Pakistan ownership of fully automatic firearms is allowed.

In large countries, automatic firearms can usually only be used by the military and police.

In countries where automatic firearms can be used by the public, there are usually very strict rules on their use.

The speed of fully automatic firearms is compared to each other this way.

Other similar weapons not usually called automatic firearms are the following:

The six assailants, armed with automatic firearms and knives, were disguised as members of the security forces.

In this era of warfare they only existed as mounted support weapons, automatic firearms had yet to be developed.

An open-bolt mechanism is a common characteristic of fully automatic firearms.