I recognise those pictures!
Lee I'm very interested in the locking mechanisim for the break barrel. Are you going to be able to slap it shut like you see done in movies to the M79? I know that's not something you'd want to do with a timber version of course but I mean in theory. I've dreamed of building a bloop gun prop as it's quite a simple design but how to get that automatic open/shut on the mechanisim has eluded me.
Maybe if I put ideas on paper instead of just rolling them around in my head I could get somewhere with it...