Alright, so I have a G17 Gen 4, that I've upgraded with a half dozen parts from Zev Technologies. This includes: Slide Barrel Pin kit Magwell Mag base pads. This is pretty high end expensive stuff so you can understand my frustration when I rack the slide I'm getting a screeching noise. It sounds like the slide is grinding and dragging hard across the barrel. Also just as of late the slide will not go into battery several times per mag. I've inspected the slide and barrel and there is no abnormal wear on either. Replaced the RSA and still no fix for the grinding noise, but the gun is now going back into battery. Any advice?