I think one of the main reasons for the top round to the right, would be that it is a little easier for a person to push the clip down using their right hand. That way you are pushing on the cartridge and not the open edge of the clip.
I think one of the main reasons for the top round to the right, would be that it is a little easier for a person to push the clip down using their right hand. That way you are pushing on the cartridge and not the open edge of the clip.