In 1903 the US Army adopted a new rifle, but it also had 2 standard machine guns...

[AKguy1985]

I didn’t see any mention of the Lewis Gun. When did that come into play?

Without googling I'd guess around WW1.

 

[Dumpstick]

The US Army considered it a machine gun.

ATF does not.

 

[sherrick13]

ATF does not.

LOL

FAFT

[rofl]