I have 2 g17's and 2 g19's all with a jan fire date. It seems Glock dropped the flat grey finish as these are a darker shiney finish again. couple questions All 4 have front sights that have hex nut holding them and not the older "splayed" open tenons, when did Glock go to this sight. Also all have extractors that drop freely but I have 1 17 with a #3 and 1 with a #4 extractor, same with the G19's. I assume this is to help with ejection issues??? how do you know which works better?