Ok so I got an oceanhunter sgs 80cm gun for $60 when I started and wasn't sure about it. It was cheap and was only abit extra than a hand spear so I figured why not. Anyway, I was wondering that since the barrel is just an aluminum tube, but would it be viable to "get" a 110cm gun from a longer tube with the same I.d. And o.d barrel, new spear and line, and new rubbers. I'm mostly doing shore dives up at Bundaberg so a 110-120cm gun is about right fro what I've heard.