I’m inexperienced with Glocks. Purchased a 20 a few months ago and have had problems with it from the start. The main issue is dead strikes. The striker hits the primer but gun doesn’t fire. The primer is dented quite deeply but the round doesn’t go off. The strike dent isn’t in the center of the primer either. I have read this is an issue with certain brands of ammo. In my 20 it is especially bad with S&B ammo. I have used S&B, Remington, Herter’s, SIG, and Hornady ammo. The other brands are not nearly as bad but there are still dead strikes. The rounds do fire when re-inserted. I have replaced the striker. Striker spring(new heavier Wolff). While better it stills happens. Off center strikes might be because of slight failure to go completely into battery. How do I check this? I’ve heard the extractor may be too tight. How do I check this? Another issue is the gun sometimes doesn’t close up on cycling. I have replaced the factory recoil spring with a Wolff steel guide rod and a 22lb spring thinking the factory unit may be weakened. I know it sounds goody but I swear it feels like the slide is “mushy” during recoil/closure. It doesn’t feel like its snapping back closed properly? I’m also experiencing failure to feeds. I am using new factory mags. The jams usually happen on the fourth ot fifth round from the mag. A short pull back on the slide and the jammed round feeds on up into the chamber. This happens on all brands of ammo. The gun has had approx 1500rds fired thru it now so I wouldn’t think it is a break in issue? Is it possible the barrel is slighly out of spec? Maybe the extractor? I thought I could solve the issue as I’m an old 1911 guy but this has me stumped. Thanks for any tips or advice.