I think my mid-sized M&P was a little off from the factory (down and left), but my Shield 45 was perfect out of the box. I had others shoot my mid-size and they had no problem, so I suspected it could be my eyes. I had the sights adjusted slightly. I also switched to using my left hand when shooting the mid-size M&P — this eliminated the low-left and made a huge difference in accuracy. Nowadays I always try to practice both left and right hand shooting, and I think this has helped me a lot.