BrickArms M41A 'Xeno' Pulse Rifle
The 10 mm pulse-action air-cooled automatic assault rifle of U.S. Colonial Marine Corps, featuring an integrated, underslung, pump-action 40mm grenade launcher.

The M41A Pulse Rifle is the standard weapon employed by the US Colonial Marines. It is a pulse action 10mm assault rifle, complemented by a PN 30mm pump action grenade launcher. The two are arranged in an over and under configuration, measuring 69.5cm in length (or 84cm with the stock extended).

"Hicks tested, Ripley approved."

$1
 
(Disclaimer: All BrickArms tiny toy weapons are made of solid ABS plastic, designed to be used with LEGO toys. They cannot shoot bullets and cannot be made to fire bullets in any way. Again, they are a TOY! T-O-Y Toyee!)