This is the factory Glock .45 barrel that comes stock in the Glock models 30S & 36.
Caliber: .45 AUTO
Height: 1.26 inches
Length: 4.02 inches
Rifling: right hand, octagonal
Length of Twist: 15.75 inches
Travels at: ~ 970 feet per second
Using reloaded or lead ammunition in Glock barrels is NOT recommended!