GTA 6 SMGs
One submachine gun has been shown for GTA 6: an unnamed weapon modeled primarily on the real-world Heckler & Koch MP5/40. Both protagonists carry it during the hostage sequence around the 1:15 mark of Trailer 2, and Jason’s version is notably fitted differently from Lucia’s — the clearest hint so far that GTA 6 will let players modify weapons rather than issue one fixed configuration per gun.
Nothing else in the SMG class has been named or spotted, and Rockstar has not published a magazine capacity, rate of fire, or in-fiction manufacturer for this one. If the series pattern holds, the SMG tier will fill out considerably after launch; for now this page tracks only what has actually appeared in official footage.
Confirmed & spotted
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Weapon data via GTA Wiki (Fandom), licensed CC BY-SA 3.0.