This is the factory Glock .357 barrel that comes stock in the Glock model 33. It can be used to convert the 27 to shoot .357 sig. Using it to convert the 26 to shoot .357 sig is not safe as it will not fit into the slide properly. Calibers can only be converted down, not up.
Caliber: .357 sig
Height: 1.26 inches
Length: 3.46 inches
Rifling: right hand, hexagonal
Length of Twist: 15.98 inches
Travels at: ~ 1330 feet per second
Using reloaded or lead ammunition in Glock barrels is NOT recommended!