From the top of my head: It might be mainstream, but I liked the gun sounds in battlefield 1 and 5. Also I enjoyed the slow motion gun sounds in Max Payne 2 a lot. Call of duty modern warfare was also great back in the day. Don’t know how the newer installations are holding up.
Gaming
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MW2019 and MW2022 have fantastic weapon sounds, but I think the MP soundscape is a bit of a tossup with the footstep sounds.
assetto corsa competizione
or really any quality racing game. its almost like 50% of my enjoyment
For overall sound design Prey (2017) really nails it. The stealth mechanics are also included in sound design so when you get spotted or escape there's intense auditory cues that track with the thriller/sci Fi horror vibe of the game.
If you go into it expecting a first person shooter though you'll be disappointed, it's an immersive sim for sure. Shotgun sounds really good though and there's an experimental weapon called the Q beam which has a phaser sort of sound as it fires. Also really cool.
Also, Elite Dangerous has incredible sound as well. Guns sound alright but you won't be firing them on foot as much as in space most likely.
Tetris Effect on VR (ps/quest). think hypnotic trance
Seconding Tetris Effect. Even without vr the soundtrack is great. Ultimate "flow" game. Super chill.
It's not gun sounds, but I always thought the entire soundscape in Journey was pretty special.
Squad always got me with its sound design. Nothing too fancy, just guns and explosions. But they DO sound amazing.
I feel this way about Hell Let Loose sometimes
I really really really liked the theme music and all sound design in the Red Alert 2 and Generals Zero Hour games. Those were excellent, to the point I'd listen to the theme alone when working or driving.
Devil Daggers has amazing sound design, and it has hrtf, so I could aim at some enemies blindly.
It's a small game though, and not for everyone.
Might not be in the way you're thinking but gtfo fits that description for me. You're creeping around listening for the sounds of the enemies waking up and every little sound has you on edge. At least when you first play it.
For a unique take... The music and background sounds in Kenshi. Music is so sparse that when it does kick in, and how it kicks in, is just really unlike any other game.
Max Payne 3. The soundtrack is amazing and blended perfectly into the game.
How does it compare to the first two? I loved those, but I've not tried the third yet because the cover put me off as it is a big departure from the theme of the first two.
I don't care for the Warhammer universe, or Tactics games all that much. Tactics game Warhammer 40k: Mechanicus held my attention for far longer than it should have thanks to its incredible sound design.
Amnesia Rebirth has some of the most anxiety inducing, creepy ambient sounds. If you like to be scared...
Phasmophobia and Visage are two other horror games that I think have really excellent sound design.
Never played it personally, but I remember being really satisfied with the sounds from Hawken watching the gameplay trailers. https://youtu.be/udEAEARD-Fo
Edit: reading up on it, the final game was pretty lame, and it’s apparently dead now.