Send a follow-up message to the email address, and actually got a reply on a 50cal rifle I was looking for, with pics and description.
Reverse image search doesn't show the pics being used anywhere. User 'Bounce' actually shows up on here, and seems like a normal person. [email protected] &* Joseph Correa don't show up on google or any of the big firearms trading sites that I can see (just did a quick search).
I wouldn't of course send money (especially DTA SRS HTI kind of money) without more verification, but this is pretty well put together for a scam.