A tabletop grinder with a cloth buffing wheel (or whatever you use to polish metal) will take care of that Glock lickiddysplit.
EVER gun I have gets a polish before I even take to firing it. EVERY gun I have gets all metal-to-metal surfaces polished with extra care given to the trigger and feed ramp.
Even my S&W SW40 trigger pull is smooth as silk after a quick polish to a mirror. It was jittery (or I call it ratchety) from the factory. Buffing wheel smoothed all the jitters out.
I have a Bersa Thunder thats trigger pull will rival a Kimber without any aftermarket upgrades.
I made a point of mentioning “stock” trigger.
The casual shooter isn’t going to take a brand new gun apart and polish the trigger.