Okay, are the "flaws" are the small machining "nick" on the bottom of the slide rail, and the "uneven" (?) finish texture under the slide stop lever assembly's tab?
Man, have any of you guys ever owned a Colt Government Model or Commander? The "machining marks", especially on the underneath of the slide, can be a pretty interesting road map of markings. We joked about the continued use of old machining equipment in the Colt Model O Pistol armorer class I attended several years ago.
How about the not uncommon little machining marks visible on many of the older S&W revolvers, especially their stainless ones? I remember looking at various early production 686's and thinking to myself that it was surprising when I came across one that didn't have too many obvious machining marks on the frames, barrels or cylinders, or a "clean" (of nicks, dings, etc) cylinder face.
How about the unpredictable amount of extra plastic "flashing" often visible on some Glocks, especially around the rail insert fixtures where they stick up out of the frame?
Or the way the plastic hasn't always flowed and filled in around the middle of the front frame rail fixture (on "top"), which has caused many, many buyers to go online and ask if their frames were cracked? They weren't, of course. Hell, I saw one older production G17 in our training inventory which had the whole lower/middle of the front rail fixture bare on top, where the plastic didn't flow in the mold to cover the middle of the "U" shaped fixture in the frame.
I've certainly seen my fair share of little nicks, dings, scratches and gouges in plastic frames of other guns (other than S&W), too. Right out of the box. Of course, those were all "service grade" guns produced by computer and assembled by hand. Plastic scratches more easily than metal, too.
Then again, I've seen some marks left on plastic pistol frames by new plastic holsters, too.
Hey, buy budget and get budget. When they start offering hand-rubbed, hand-finished plastic pistols using slides and barrels that have been hand-selected for pristine surfaces, edges and finishes? The cost will probably be more than the sub-$350 price you can buy a M&P 40c 2.0 for in some places.