Just got back from the range with my Glock 20sf, fired 200 rounds of Underwood (Hot ammo). 0 issues whatsoever
. Going from having a whole bucket of issues in the past 2-3 months, for some reason it looks like the Glock 20sf needs a "break-in" period to get the kinks worked out... Almost like I have a whole new handgun even though none of the factors have changed, same RSA, same grip and stance, same cleaning protocols, etc... I'd say shoot a bunch of rounds through it to resolve any problems you may be experiencing. Worked for me at least
. Good luck