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The barrels 3 inches with an overall length of 8.5 inches. Think it's just the picture making it look smaller. Hope this helps.
Its a 2.5 inch barrel. from Ruger web site.see ******** MODEL NUMBER: 1790 CALIBER: 357 MAG GripsCushioned Rubber with Hardwood Insert Front SightFiber Optic *******Barrel Length2.50" MaterialAlloy Steel Capacity6 Rear SightAdjustable Twist1:18.75" RH FinishBlued Overall Length8" Weight36 oz. Grooves5 Available in CANo Available in MANo UPC7-36676-01790-4 Triple-locking cylinder is locked into the frame at the front, rear and bottom for more positive alignment and dependable operation shot after shot. Grip frame design easily accommodates a wide variety of custom grips. Disassembly of integrated subassemblies requires no special tools and allows for easy maintenance and assembly. Transfer bar mechanism provides an unparalleled measure of security against accidental discharge.
Josh check the ruger site for 1790 its a 2.5 inch gun https://ruger.com/products/gp100/specSheets/1790.html