I suspect "DI" means Davis Industries. I'd start with www.gunpartscorp.com for a magazine.
I was spending time with my grandpa today and he showed me one of his guns, a DI .380.
Does anyone have any info on this? It is missing a magazine. any cahnce of locating another one?
Well I have looked into it, and I do not wish to even take the time to buy a magazine, let alone try to fire it
(edited after a little more research)