Or are attachments purchased via an in-game economy that is surprisingly so complicated it's best not to think too much about it?

Er... I mean...

GRAKATA!

... that's not a Grakata, [url=https://www.youtube.com/watch?v=qHU51KNBw_c]but I still want[/url].
-[i]Technically it's a flamethrower[/i], since it has minimal blast effect, but ridiculous amounts of fire.. although explosive and buckshot are available.