Watch the for sale forum here and at BR. There's also a fair number of parts available on ebay but fraud is rampant where collectability is concerned. They run anywhere from $80.00 to $120 depending on how they're assembled and if they come with a piston and a plug. Best deal I got was a complete welded cylinder with piston and plug for $105 shipped.
Fulton Armory was selling welded as well as screwed gas cylinders awhile back. Check their web site for more info.
Fulton Armory was selling welded as well as screwed gas cylinders awhile back. Check their web site for more info.