You're talking about an operation that involves intense heat and pressure, subjects your handgun to tens of thousands of pounds of pressure repeated over the course of hundreds or thousands of times, and requires tightly fitted parts moving at high velocity. Friction occurs and with it, inevitably, wear. This can be especially expected during the first rounds through a firearm as parts wear to fit each other better. Wear is normal. If it worries you I suppose you could always use a little more lubrication. However, if you are maintaining your firearm like you're supposed to, normal wear should not have a largely adverse effect on performance.