[SC4006]

First off this is my brother's ak, but he's not apart of this forum so I thought I'd ask for him. His wasr 10 has had problems with jams ever since he bought it, not sure why he didn't try and trade it back for another but he kept it. Probably about every 5th round jams, sometimes more, so we've even nicknamed it the "JamK-47". I don't know the exact specifics on what happens during each jam, but it definitely seems like every jam has a round that's angled up too far. He's tried different ammo and magazines and none seem to help. Sometimes we are able to close the bolt by pushing on the bolt handle, so I really don't know what part of the gun is causing the hangups. I don't have pictures so just any general idea would be helpful.