..the A-Team were busy springing the looney helicopter pilot when they suddenly became aware that someone was using them to hi jack at hread..furious B.A roared "FOOL!" .But Hannibal only guaffed ..What was a little thread jacking as long they never did get to the bottom of who framed them..
the end
anyways-
try googling Mr Luty and expedient homemade guns ,british standard gun etc
you should come up with a few rather easily made types of firearms made fromfreely available stuff that could be good to go in game settings..
found the link again
http://whatreallyhappened.com/RANCHO...m/index-2.html
otherwise -what Fusilier said is absolutely most practical .Rifle barrels need to withstand a lot of pressure.Making one that is light enough to carry around isnt in my definition of simple technology .But we all have our own I guess.
Good old sten gun of course .The Russian PPsh-43 and the -41 to some extent . Maybe something using existing parts to build a standard gunlike the ppsh - 41 was made from old moisin nagant rifle barrels in the beginning.
(all of the above are on our V.2.0 sit eby the way )