The extra rounds are metal and significant, but they were difficult to load into the Thompson stick mag I bought them for. If only they made mini-mag loaders! The Thompson itself was beautifully crafted and also feels significant in the hands, although the barrel and lower assembly fit together just a hair off so that the screws didn't go completely in flush, but don't even notice it now that it is assembled. My 8 year old, fascinated with WW II, loved it. Waiting on the M1 Garrand with the 8 round "ping" ejecting clip.
