My favorite gun in all the video games I've play so far is definitely the halo 4 dmr for me I like it because it's a mix of overpowered but not so overpowered you can't take out the guy using it also DOOMS super shotgun is fun too

For me, its a three-way tie between the Battle Rifle from Halo, Revision Zero from Destiny 2, and the Triple Take from Apex Legends.
I love the Battle Rifle for its design and the fact that it was one of my first experiences with Halo.
I love Revision Zero for its versatility and ability to switch between a 2 round burst and 4 round burst.
I love the Triple Take for its concept of a shotgun/sniper in one of my favorite Battle Royales.

There was this really old game for the 360 called Timeshift, had a really funny gun that was basically a SMG with a Flamethrower alt fire if I remember correctly, have to go with that definitely

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The idea of a game for the 360 being described as "really old" makes me feel old. Though I will say that weapon you speak of is pretty nice. That game had a lot of interesting, fun ideas I wish had been used more in other games.

Honestly one of my favorite firearms comes from a game that otherwise tends to be unfairly panned, Borderlands: The Pre-Sequel.

The Bogonella shotgun, which always has a lovely, hilariously crude opinion to share about your enemies.

Also, because I desire to show how I am a washed up ancient crone as far as this fandom is concerned, I'll deep cut by saying another one of my favorites is the chain gun from Wolfenstein 3-D.

https://wolfenstein.fandom.com/wiki/Chaingun

It's so satisfying in how it can stunlock almost all enemies in the shooter that more or less invented the FPS trope.

Though for a codifier, my final one would go to another shotgun, this one being the Super Shotgun from Doom 2.

https://static.wikia.nocookie.net/doom/images/7/7d/DoubleBarreled_firing2.jpg/

Extremely satisfying to end a lot of demons at once with this powerful beast.

Dunno if I can list a singular favourite, but I do have multiple 'love to use it' weapons.

The Plasma Beam from Metroid Prime 1 being one such weapon.

I’m honestly surprised no one said it yet but the BR in Halo 2 was absolutely amazing and so fun to use, even in Halo 3 it was fun to use.

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Soma Prime (from Warframe). An LMG that can easily shred hordes of enemies with a single magazine and still have bullets left to spare. And with the new Incarnon system it can transform into a full-auto shotgun that hits even harder.

Haven't found a game where I could wield an AA12 shotgun, so I'll stick with the M1 Garand.

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Nobody's said it yet, so the RYNO.

Specifically the RYNO V.

Not only is it the fifth version of a gun so epic that its name is an acronym for Rip Ya a New One, its a shoulder-mounted rocket launcher with dozens of barrels, and is awesome enough to blast Tchaikovsky's 1812 Overture WHILE it's being fired.

KS-23 from Insurgency Sandstorm.

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Okay, I'll give you that one. It *is* easily my favorite version of the RYNO.

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That is a gorgeous gun actually to bad we can't make anything like it irl yet

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I've only played 1 or 2 games that have the m1 but everytime I use it in said games it's a beast I'm hoping it's added to cod mw2 next season

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The halo 3 br is my personal favorite

M1 Garand from the MOH series

M83 barret.