Yep. That’s a well-known popular sound effect, and it is ~not~ really how gunshots sound, especially when captured on a video camera.
Yeah, the sound effect is a rifle sampled outdoors.
Now if they really wanted to go for realism, they would’ve had to fire the weapon indoors into a bullet catch at four different angles inside confines of the same materials and shape.
*chuckle*
A 9mm would have sounded like a series of clicking pops.