This is the factory GLOCK .45 barrel that comes stock in the GLOCK model 21 and 21SF. It can also be used to convert the 21C to shoot as a non-compensated. Using it to convert the 20 or 20SF to shoot .45 ACP is not recommended and unsafe as it is not a 100% fit. This barrel will not work extended in the 30 or 30SF due to the difference in the locking blocks.
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