A rifle originally designed in Imperial Russia in 1891. It saw many updates and configurations and the Model 91/30 (1891/1930) was Soviet Russia's standard infantry weapon. It uses the oldest military cartridge still used today, the 7.62x54mmR, which is also used in the Dragunov Sniper Rifle and PKM machine gun.
It is also the rifle used by the Soviet forces in the game Call of Duty and the movie Enemy at the Gates.
This weapon was manufactured in 13 countries, either making their own variant, borrowing from Soviet Russia, or making them for export. Mosin-Nagants are available today for about $60-$150
(The picture above is a pic of mine, a 91/30 Russian)
OMGWTF The M44 Mosin-Nagant Carbine SO beats the 91/30 Mosin-Nagant rifle!