my suggestion is that you should not worry about that.... my SD9 looks just like that, has a small left to right movement of the slide at the front of the frame .... 2600+ rounds fired and ZERO malfunction!!!

well she malfunctioned once - broken firing pin at around 2500 rounds fired right at the nose of the pin..... still unsure why or how the firing pin broke after so few rounds..... got a replacement and flawless for just about 100+ rounds s far...

enjoy your Smith and Wesson SD9VE!