This is the factory GLOCK 9mm barrel that comes stock in the GLOCK model 17. It can also be used to convert the 17C to shoot as a non-compensated. Using it to convert the 22 or 31 to shoot 9mm is not recommended and unsafe as it is not a 100% fit. This barrel will not work extended in the 19 or 26 due to the difference in the locking blocks.
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