Here's a few shots of 'The Ambassador' TF2 prop I am working on.
By casting the barrel separately first I can make kits that can be added onto a 30 dollar airsoft revolver you can purchase on Amazon (And it will remain functional). So although they are not as accurate to the in game item, it still makes for a neat airsoft gun. But you want a more accurate con ready piece I plan to cast the full replica you can see in grey there. I am still putting together the sight rail for it.
This is my first experience with mold making and casting, so if you have any advice I am all ears