This unnamed Capo-branded pistol is due to appear in Grand Theft Auto VI and appears to take its core design from the Colt M1911, combined with a Beretta 92FS-style trigger guard and barrel engravings inspired by the broader family of M1911-derived weapons. Jason is seen holding it during a liquor store robbery alongside Lucia near the end of the game's first trailer, and it also appears in an official screenshot in the hand of Raul Bautista, seated in a car with a bag of cash on the passenger seat. Beyond the in-fiction Capo manufacturer name, no further specifications have been revealed.
Weapon data via GTA Wiki (Fandom), CC BY-SA 3.0.