If the above suggestions fail, try putting some electrical tape on the back end inside the magwell.
If you are using green label PMAGs, the little circular cap on the top with "60" is removable. If you turn it 90 degrees(some caps are glued in place, using a hammer to give it a light tap will break the glue), the spring will push it out enabling you to clean the inside of the magazine and the follower.
Originally Posted by pusangani
Did he not pay his ASC bill this month?