Honestly, I dunno what's the worst aspect here: the threading job, the filed down front sight to go with it, the optics mount, or the fact that's almost certainly the abysmally shitty stock Nagant trigger...

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Honestly, I dunno what's the worst aspect here: the threading job, the filed down front sight to go with it, the optics mount, or the fact that's almost certainly the abysmally shitty stock Nagant trigger...

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Ian from forgotten weapons really is out here every video with a completely straight face like "This is the 1902 Heimerdinger Fuckbucket. It's infamous for requiring the shooter to put the barrel in his mouth in order to reload. It has killed every single person who's ever shot it and its ergonomics are classified as a war crime in the geneva conventions. It fires a unique 200.8×3mm cartridge with a cubic bullet. Some third world country was using it as their main assault rifle until last week. Let's take her down to the range"
just a normal submachine gun nothing to see here everyone move along
Behold...
The Milglockee
Ghost Recon: Breakpoint has decent gun customisation.
For examlpe, here is a SCAR
G36C
Kriss Vector
But then i found this gun and remembered i have GIMP..
So that's what came out of it

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Submitted by @euanpc. Included caption:
Are they holding the pistol right? Is there middle finger on the trigger here?
Closest ID I could get you is a Smith & Wesson Model 10 (many calibers, likely chambered here in .22LR). It's a little wonky, though. Here, let me get you a reverse image searched higher quality picture:
To touch on the "are they holding it right?" question, you can clearly see that they are holding it with both hands; their right hand is obscured by their left, and may actually be positioned "correctly" to fire it. The left hand grip is a bit weird, and should just be under or in front of the right hand instead of wrapped around the gun.
Regardless, the gun is a bit weird, and I can't fully ID it or even be confident in it not being a prop. The screw above the grip looks unnatural for firearms, as does the cylinder release. It may just be a perspective issue, but it looks like the top chamber of the cylinder does not even meet with the center of the barrel properly, either. It also looks like the cylinder crane actually blocks the top chamber as well.
Ruby: Okay, Jaune. I've taught you basic gun safety but now it's up to you to decide your firearm.
Jaune: Wha-? But, Ruby!
Ruby: Nope.
Jaune: Ruby, I-
Ruby: Nope.
Jaune: I need your-
Ruby: Nope.
Jaune: Stop saying noop!
Ruby: Noop. Jaune, it has to be you who decides what you want as your gun. My mother used a shotgun and I wanted to be like her but my high caliber sniper rifle is the best suited for me because I'm me. It'll be an extension of you, who you are. Which type of firearm, how you customise it, everything!
Jaune:... fine but could you at least pick out a few recommendations and I'll see if they're for me.
Ruby: I guess that's fair enough. Here.
Ruby: You got an AK-74u, a Glock x13, M4 assault rifle, a Basilisk revolver, a Bryson 800, a Fennec 45 and a SA-B 50. Have at them.
Jaune: Okay. **Struggles to carry all guns into room because he doesn't want to make more than one trip.**
Jaune: Okay, Ruby, come in but close your eyes.
Ruby: **Eyes closed** Oooh! I'm so excited to see what you have! I can't wait!
Jaune: Now... Open them!
Ruby: **Eyes open** AHHHH-......
Jaune: So? What do you think?
Ruby: **Voice breaks** Jaune... what the fuck did you do?
Jaune: What? I liked them all and decided to customise them how I wanted.
Ruby: Jaune, I don't have the words to describe how sick these make me. The only way a war could be fought with these is by the enemy side killing themselves by their own firearms out of the risk and shame of being killed by one of these pieces of shit.
Jaune: What? It's not that bad.
Ruby: Jaune, if I had to use one of these fucking monstrosities to save my sister, I would happily let her die.
Jaune: Seems a bit extreme.
Ruby: What you have done should be considered a hate crime with capital punishment. Wait? Is... is that *Gagging* is that a- Hurk!... is that a- Hurrrg!... is that a sniper scope... on a fucking sawed-off shotg- **Vomits** BLURG!