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Hiu Marvin and welcome. In summary: An "HGA" designation on a Glock pistol is not a standard Glock model, but rather a distributor-specific label used to identify a particular configuration or feature set of a Glock pistol offered by a specific retailer. Example here (reduced dimensions): https://heroquartermasters.com/product/web-glock-19-g19-hga-9mm-4-0-bbl-fs-5-2-10rd/ -- Cheers stay safe and enjoy!