Worst one I have owned so far was a S&W 4566STW. Boy did I really want to like the gun, but it POI was always way below POA, and after trying 3 different grips on it and S&W replacing the front sight with a shorter one--my grouping still looked like I had been shooting buckshot. Sold it, and bought a S&W 1911. Complete night and day, first clip I was on center and grouping--well as good as I've ever shot.

Dito on the 4566 and the POI/POA, I didn't send it to S&W, after trying just about very type of ammo in the world, I traded it for a 686 4" and swore I would never have another big bore semi-auto..my wheel guns are 1000% more accurate..