Is there a sniper rifle in GTA 6?
The direct answer
Yes — a sniper rifle has been spotted, though Rockstar hasn’t given it an official name yet.
The confirmed entry is cataloged as an unnamed Duke Arms Company assault sniper rifle in the currently revealed material — meaning the class and manufacturer are established, but a proper in-universe model name (like GTA V’s "Marksman Rifle" or "Heavy Sniper") hasn’t been confirmed.
It’s currently the only confirmed sniper-class weapon in GTA 6’s revealed 21-weapon arsenal, which otherwise leans heavily toward handguns and melee weapons at this stage.