THE M4 CARBINE (GB) ROSSO OLIVIER

The M4 Carbine and its variants fire 5.56 x 45mm NATO ammunition and are gas-operated, air-cooled, magazine-fed, selective fire firearms with a 4-position telescoping stock.
The M4 can trace its lineage back to earlier carbine versions of the M16, all based on the original AR-15 made by ArmaLite. It is a shorter and lighter version of the M16A2 assault rifle, with selective fire options including semi-automatic and three-round burst.