Sungazer wrote: "It is a bit of a strange industry there doesnt seem to be any type testing or standards that have to be met by any manufactures or part manufactures"
Really? You've never heard of SAAMI? or C.I.P in Europe? (They have been proof testing firearms and ammunition since the 16th century.)
All small arms and ammunition manufacturers are held to very strict manufacturing standards and testing.
"In my club there is an old bloke that has made his own barrels even sold them. i saw one of them in use only a few weeks ago it shot as well as any custom high end barrel manufacture. I was very surprised"
Or, is he simply buying a rifled barrel blank and chambering, profiling and fitting?
Also, it is illegal in some Australian states to modify a firearm unless you are a licenced dealer or gunsmith.
I'd be staying well clear of a bunch of "old blokes" missing eyes from blowing up Omarks.