This is the factory Glock .40 barrel that comes stock in the Glock model 27. It can be used to convert the 33 to shoot .40 s&w. Using it to convert the 26 to shoot .40 s&w is not safe as it will not fit into the slide properly. Calibers can only be converted down, not up.
Caliber: .40 s&w
Height: 1.26 inches
Length: 3.46 inches
Rifling: right hand, hexagonal
Length of Twist: 9.84 inches
Travels at: ~ 935 feet per second
Using reloaded or lead ammunition in Glock barrels is NOT recommended!