I am glad some clarity has arrived on this thread, Damon.

I do however feel a slight difference in charging my gen 4 .45 compared to my old Gen 3. Is it due to the spring being older/more used in the gen 3? I don't know, but there is a slight difference. No issue for me, but may be for a small/weaker person. I am 5'10" and 145 lbs and have no issues.

I agree with your assessment of the generational factor and the issues within. I have fired the G19 G3 the same day I fired my G21 G4 and neither had issues. However, the owner of the G19 did mention he has had issues in the past and it was the extractor to blame according to him.

I will repeat myself from earlier, my G21 has had zero malfunction with or without an X300 or TLR-1s attached and the first thousands rounds fired did so without a single cleaning.