Ruta Locora (sp?) Makes a kit that's uses on a Chimpmunk rifle that gets it down to 16oz. It comes with a carbon fibre wrapped barrel and a tube stock.
Interesting. And kinda weird. Lol between the cost of a rifle and the kit, it's probably too much money for my liking though.
Get a youth model H&R .22 Sportster, I make a QD Takedown knob for them, they go together in 10 seconds and are light, extremely compact and feel like a "real" rifle... plus they are exceptionally accurate... unfortunately, you will have to shop the used market.
Any idea how much those weigh? And what they go for used these days?