This is the factory GLOCK .40 barrel that comes stock in the GLOCK model 23. It can also be used to convert the 23C to shoot as a non-compensated. Converting the 32 or 32C to shoot .40 s&w is also possible. Using it to convert the 19 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. This barrel will work extended in the 27 and 33.
Glock Barrel 40SW 4.02" Glock 23 SP04466
WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov