Thanks Markus. I don't know how I missed those first two threads. I looked at just about every thread that had the word 'Jawa' in it. Or so I thought.
I was confused because the parts of star wars site says this:
"Under the rifle there is a black cord or hose attached to the metal loop located just in front of the ammunition clip. This attaches to a metal canister, probably brass and/or copper, that may be an antique gun powder flask or oil container. There is a thin leather strap attached to the side of this container that was slung over the Jawa's shoulder."
I snagged the one DCB had up for sale. I'll be selling the spare Enfield Ion gun I have shortly if Hook doesn't want it.