I picked up what I think is a MEC 600 Jr Mk V off of Marketplace for a steal. There's no label or anything on it to properly ID it though. It has an odd primer tube and slider assembly that I don't see on any of the MEC documentation, so I'm not sure. Here's a pic, if anyone could help me figure it out. Pretty sure it's setup for 20ga, but I'll verify when I get home and have a shell to compare it to.
Thank you!
MEC 600.jpg