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Glock says no lead bullets in their barrels. An aftermarket barrel would "CYA".

Paul, I have used both no issue. Hard Cast is not soft lead. On the stock barrel just do a good cleaning to remove leading. I have a 6 inch Glock 20 barrel and aftermarket 40S&W, 357 Sig and 9x25 Dillon Lone Wolf and KKM barrels but shoot mostly 10mm from one Glock 20. Just clean it good and you are fine Sir with hard cast ammo.