Hi Bruce,
The Owen Gun Mk.1/42 (Lysaght's nomenclature - the Army called it a Mk.I) was:
32 inches overall length with butt;
24 inches overall without butt.
Sling length was 57.5 inches
Weight with butt & empty magazine: 10 lbs 3 oz
with butt, and full mag: 11 lbs
without butt, mag empty: 9.25 lbs
without butt, mag full: 10 lbs
Mag capacity: 33 rounds of 9 mm Parabellum.
Cyclic rate of fire: 600 rpm (as a comparison, an M1928A1 had a cyclic rate of around 700 rpm, and the Austen Mk.I rate was around 500 rpm)
The Owen Mk.I was a selective fire weapon: safe/semi-auto/full auto, selected by different placement of the change lever.
The Owen's nomenclature was different at various times: from acceptance into service until 9 March 1942, it was a 'Carbines, Machine, Owen Mk. ...'. From 9 March 1942 until May 1946, it was a 'Gun, sub-machine' (along with the Thompson and Austen), then it was changed back in May 1946 to being a 'Carbines, Machine, Owen Mk ...' the last change in order to conform with UK practice.
There were three SMGs in service with the Australian Army during WW2: the Thompson (M1928A1, M1 and M1A1), Austen Mk I & II, and Owen, the Austen and Owen being locally manufactured. Others were contemplated (such as the Reising) but not acquired in quantity.
I know of a few Owen guns in public collections in the USA. The Smithsonian Museum of US History has one (or two?), and the Pentagon has one in a corridor display along with other Australian 'stuff'. The Oregon NG Museum also has one. I wonder if the CWM has an example in their firearms collection? Might be worth asking.
There are plenty of files available about the Owen Gun at the Aust National Archives. Using the search terms 'Owen' and 'gun' turned up 114 (not all Owen Gun related), several of which are digitised and available to view on-line:
https://recordsearch.naa.gov.au/Sear...msListing.aspx
Using other search terms like Machine Carbine may turn up more. Happy reading, Bruce!
Regards
Mike