Gen 5 are just a tad wider then previous generations, so a polymer holster may not fit, but my leather ones I have no issues since the leather will give some, but my Gen 5 G19 fits my Gen 4 holster fine.Not sure about that, at the GS the sales guy put my gun in a Blackhawk Serpa for a Gen4 and it got stuck, SafariLand has holsters and it’s listed on the website (for Gen3+4 not Gen5