so i was playing with the slide, imitating the blowback action, and i noticed that the slide runs into some friction at the point where part #72 (diagram below thanks to the internet) touches a bump on the underside of the slide that pushes the part down (for what reason i dont know). i also noticed that if the slide doesnt go pass this point, the chambering "nub" wont have the distance to chamber.
the part and slide seem to be properly lubricated, is this is the problem?
