This is the factory Glock .40 barrel that comes stock in the Glock model 24. It can also be used as an extended barrel to convert the 22C to shoot as a non-compensated. Using it to convert the 17L 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. You can use it as an extended barrel in the Glock 22, 31, and 35.

Barrel Info:

Caliber: .40 s&w
Height: 1.26 inches
Length: 6.02 inches
Rifling: right hand, hexagonal
Length of Twist: 9.84 inches
Travels at: ~ 1148 feet per second

Using reloaded or lead ammunition in Glock barrels is NOT recommended!