Glock 20 plus 200 grain Buffalo Bore and 200 grain Corbon penetrator load equals malfunctions in my two Glock 20 SF's and one standard Glock 20. I would be curious how much of that you have run thru a G20, and whether it has been reliable. We tried factory and the Wolff recoil springs/guide rod, and that didn't seem to make a difference.

Just got some 200 grain penetrator ammo from Double Tap, and that is running in two G29 SF's we have, but haven't had a chance to try it in the G20's yet.