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https://www.brownells.com/gun-parts/handgun-parts/handgun-barrels-parts/match-grade-barrels-for-glock-21/?msockid=028d9a96147c6f2818548fcc156e6e74&sku=078000553
https://lonewolfdist.com/barrels/glock-compatible-barrels/g20-21-40-41-full-size/alphawolf-barrel-for-m-21-45-acp-threaded-578-x-28/

Hi Jennifer and welcome. Bar-Sto: https://barsto.com/product/fits-glock-21-45-acp-extended-threaded-gen-5-this-one-only-fits-gen-5/ ------------------------------------- KKM: https://www.carvercustom.com/ecommerce/comps-barrels-glock-xdm-s-w-m-p/glock/glock-threaded-barrels/glock-gen-5-barrels/kkm-gen-5-45acp-threaded-barrel-for-glock-21.cfm ------------------------------------- https://www.brownells.com/gun-parts/handgun-parts/handgun-barrels-parts/match-grade-barrels-for-glock-21/?sku=078000553 ---------- cheers, stay safe and enjoy!