The Mustang .357 is a revolver made by the Duke Arms Company. Its name has not come from a Rockstar announcement: it was read off the gun itself in an official screenshot.
Where it was spotted
GamesRadar found it in one of Rockstar’s Ambrosia stills on the Only in Leonida page, held by one of a pair of bikers. The outlet identified it from the logo and the engravings on its side.
What it is based on
PC Gamer describes the Mustang as a high powered revolver based on the Colt Python, and wonders how it will compare with the Hawk & Little Morgan Revolvers from the Ultimate Edition.
What we don’t know yet
Rockstar has not said where to buy the Mustang .357 or what it costs. Damage, fire rate, cylinder size and price get added once the game is out on November 19, 2026.