This Storm Lake Glock 19 barrel is designed to be compatible with the Glock 19 in 9mm. Storm Lake Designs their barrels in a way that they decrease the tolerances but allow for a drop in fit on most applications that may require slight modification on some installations.
Storm Lake barrels are machined from 416R stainless steel. This steel was developed by Crucible Industries with the specific intention of being used in high grade precision rifle barrels. The barrel chemistry was engineered in such a way that it gave the steel many desirable properties. 416R stainless has good machinability, which allows the steel to be machined and lapped to a high finish. This is very advantageous for consistency and accuracy.
The chamber for Glock pistol has been a concern in the past. Mainly, these concerns have been focused at the lack of a fully supported chamber. The lack of a supported chamber can lead to bulging brass and other issues. When Storm Lake designed this barrel, they made sure to include a fully supported chamber. The chamber in this Storm Lake Glock 19 barrel allows for full case support to prevent and potential issues that a non-supported chamber may cause.