Picked up a cool looking MISR 10 today with a just got ran over by a tank look, took it to the range and it won't feed from mag. Tried 4 different type mags. Bolt just slides over rounds. Only if I loaded a mag with the top round on the right side of mag and held rearward pressure on mag it would chamber. But then it wouldn't eject the spent casing and would jam. So nothing but FTFs and FTEs. This rifle looks like it's been thru hell and back so I know it has ran like a champ sometime in its life. I want to revive it. What should I do first? This is my first AK for shootin so I'm ignorant to making this platform perform.