BudsGunShop.com - Is this Glock CA legal

George, no Sir, Gen 4 nor Gen 5 Glocks are on the CA DOJ approved Roster : https://oag.ca.gov/firearms/certified-handguns/search?make=150972

The gen 3 G21 (CA compliant) is available here
https://gun.deals/search/apachesolr_search/glock%2021

No unfortunately the gen4 Glocks are not CA legal. They are not on the California DOJ approved handgun roster.
Only gen3 and older are on the approved list as California has not added any new guns onto the approved list in many years.
Full list here
https://oag.ca.gov/firearms/certified-handguns/search
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The gen3 G21 with 10rd magazine is approved.