It's interesting. I was in Colorado visiting friends, getting ready to do my weekly antibody infusion, and I'd forgotten to pack the monster needle to load my 60 ml syringe from the small bottles. I called the Walgreens that was about a mile away, described exactly what I needed as I even had the catalog number and exact gauge and length in my iPhone. And he gave me one. He knew it wasn't suitable for drug use/self-injection, the needle isn't sharpened that way. And his sister does home medication for a similar condition, so he was familiar with the equipment that she uses and recognized what I was describing.

A friend of mine is a watch/clockmaker, he uses similar syringes to what you describe for his purposes.