I'm trying to figure out what size the o-ring is that fits in between the shroud mount (#20 on the parts diagram) and the breech block. I believe that it is part #39 per the detail but the description dose not specify a size just"o-ring". Can anyone help me? Also if anybody knows the sizes, durometer ratings etc. for the rest of the seals on the .177 it would be tremendous. I would like to buy some spares to keep on hand
Thanks all