OR a P90 OR an M14 with the feed turned upside down.
Show me a man who will jump out of an airplane, and I'll show you a man who will fight!
General James M. Gavin
CRY HAVOC AND LET LOOSE THE DOGS OF WAR
I think what Pat is saying is, the initial cost is not the only thing to consider, to make it a viable skirmishable airsoft gun you may have to put a bit more money in to it, otherwise you might as well buy a Thompson. If you just want a prop Deac 30.Cals are considerably less than the cost of a Viva 30.
true. i know a few guys that are good at the m14 gearbox and i fix airsoft guns myself 
i love a good challenge and ive been reading about peoples problems with the m1919. so i think i might have to throw about 100 to 200 GBP alone in extra parts. but it could be an interesting project. 
Winters: We're not lost, Private. We're in Normandy.
Winters: We're paratroopers, Lieutenant. We're supposed to be surrounded.
