The 16ga frame size is easy to see with the triggerplate extending almost all the way to the reciever sides. I have a nice 12ga on 16ga frame and it is extra nice. In the first pic the 12ga on sixteen gauge frame is on left(I lined up the top surface of the actions so look at the bottom to see the amount of difference). There is a shadow on the 12ga frame so you have to look close to see there is a lot more material between the edge of the floorplate and side of the action. The second pics barrel flats are:Left side 12ga B grade 12ga gun 12ga frame,Right side A grade 12ga gun 16ga frame. There was a 16ga gun with 12ga frame as well.
Ross
