Semi Auto knex gun with detachable mag

This is a contest for a semi auto knex gun with detachable mag. A suggestion i'm making is try to make an AK47, AK74 or MP5. I think those would be the easiest designs to make a semi auto gun. Also those guns all have mags. This is a list of the rules for the contest 1. Must be Semi Auto 2. Must have detachable mag 3. Hopefully some type of sight 4. Ammo can't be grey rods or red rods 5. Can't use modified or broken pieces 6. All entries must be in by July 30th,2009 Contest starts Saturday, April 11, 2009