I've hunted down every confirmed GTA 6 gun in its trailers and screenshots so far

The full name of this Capo pistol isn't known yet, but it turned up in the earliest GTA 6 reveals. Jason was holding it at the end of the liquor store robbery that capped off the first trailer, and Raul Bautista has one in a later screenshot. It looks a lot like a Colt M1911 to me.

Another weapon currently lacking an official name is an SMG very clearly modelled after the MP5, which we saw both Lucia and Jason using while robbing a bank in the second GTA 6 trailer. Jason's also had a red dot sight, which will probably be an in-game upgrade.

Like the Duke carbine, we can clearly see the insignia on the magwell marking this one as a Duke-manufactured rifle, but it's not got a model name yet. We see it used by a hunter, where it appears to have been modded with some rail slides. It could actually be a modified version of the carbine, though, because a lot of the base parts look the same.

We can see two hunters roaming the woods in one screenshot, carrying what look like two different snipers. The clearer one looks like a Remington 700 bolt action, which should hit pretty hard to make up for the slower firing.

The poachers continue to show off new rifles without visible names. This time it's a sniper that looks a lot like an M1A. If I had to guess, it'll feel like the marksman rifle in GTA 5, boasting a higher rate of fire but less damage than a traditional bolt-action.

We don't know what this SMG is called in-game yet, but it's very clearly designed after the MAC-10. You can tell by its very boxy design and stubby protruding muzzle. Of course, Jason's glamoured it up with the paint job from the Vintage Vice City pre-order pack in this image.

It wouldn't be a GTA game without a classic double-barreled shotgun now, would it? We've seen a hunter aiming one at an alligator in a screenshot, where it's clearly got a full-length barrel. I'm curious whether we can trim that barrel down to make a sawed-off.

In the second trailer, we're treated to the obnoxious owner of Phil's Ammu-Nation touting his goods. In the brief clip, he picks up what looks to be a machine gun modelled after the M249 with a very large box magazine.

On the racks at the back of Phil's Ammu-Nation, we can see a variety of different AK-47 models, which I'd bet are an example of different attachments you can select from.

Also in the background of Phil's Ammu-Nation are a bunch of different SMGs. To my eye, it looks like various setups of an Uzi (stocks, sights, that sort of thing), and potentially an MP7, MP9, or TEC-9 up there too.