I don't think so a buddy had to send his glock in for problems with his extractor and was in a hurry to get it to them he didn't take his connector or competition springs out. They fixed the issue and replaced all internals with oem and sent the aftermarket parts back with his gun in a ziplock. I'm sure someone will post shortly that has more knowledge on the subject that is just my .02 Like chuck said just take a couple of minutes and put the oem parts back in would be quick and easy
I ve read and watched enough you tube videos. I already feel confident enough ti install the mods. Appreciate the quick reply. I think trigger kit should be stock item. I checked out a ghost equiped glock 34. Very smooth.