I agree with AP's post. That is why I also stated the same thing.
Some handgun brands or models may have minor changes or the engineers may have made slight changes, even in the same model over a period in time.
Major holster/gear company Bianchi,
www.Bianchi-intl.com made this point in their old printed catalogs.
That's why it's a smart move to fully open a holster then fit the unloaded weapon inside it. Tighten or clamp down the tension screws and let it sit for a few hours.
Polymer or kydex rigs are not complex they just need a proper, secure fit.
Some handgun shooters like lined holsters but I'd heard that many rigs can retain moisture or draw dust/grit/sand etc.
CF