Rihanna did her best impression of Rambo Thursday night — when the singer let loose with some FULLY AUTOMATIC MACHINE GUNS.

Reports TMZ:

RiRi rolled up to the Guns and Ammo Garage in Las Vegas for a midnight session at the gun range — where we’re told she shot a variety of fully automatic weapons, including the SAW machine gun and the M4 and AR-15 rifles.

You gotta check out the video … because who doesn’t love watching a hot chick shoot a gun???

And now…the video.

This is EbenGregory.com…telling you a hot girl busting her gun. That’s the sh*t I do like!