This was a quick one that I knocked out last week, absolutely hounding over the trailers/marketing leading up to Alien: Romulus. I was frame by framing the trailers to figure out 2 main things pre-release: what is that screen behind the iron sight, and how does the Smartgun-esque deployable stock/harness work exactly. The stock was a big one because all the details were super blurry in the early trailers, but luckily (aside from spoilers) they released a lot more pulse rifle footage in the days right before the release.
EDIT (9/18/2024):
Andrew Bradbury has uploaded his official version of the rifle to Artstation! Crazy to see he's the artist who designed this, I've followed him for awhile for his insane Aliens rifles and Halo work, check his official one out here:
https://www.artstation.com/artwork/3EdWYm
Functions are pretty accurate to the movie.