Jawa ion blaster???

hello,
i tried the search, but got no results. It seems the the piece behind the grenade is custom, but i do not have the skills or the machine to construct one. Has anyone here found an alternative solution? Only thing i could think of was copper couplings from home depot, but just seems too thin and weak. I was also wondering on, what type and color of wood varnish has used for the cut ends?
thanks everyone
darthsniks

To me they look like antique guns with a siren/horn or flame thrower nozzle.

you can get the adapter from fieldmarshall here:

If you are referencing the most commonly discussed Jawa blaster, it is made from a WWI era ShtLe (British Lee Enfield) cut down stock, shortened barrel, bolt with parts removed, and a Brit cup grenade launcher attached to the end.