the most prevellant weapon would be the AKM, it is just the AK47 in a product improved model that was issued like rice-to everyone
it came in around seven punds empty, a little over eight loaded with a thirty round magazine. it iwas a 7.62x39mm, about 2400 feet per second at the muzzle, about as powerful as a .30-30 hunting rifle. good for about 300 yards in the right hands, or about 75 yards in the hands of most russian soldiers.