I was pretty happy to get some new sights for one of my subcompact pistols. I installed them today and went to the range. Unfortunately, they sent me the wrong front sight. Probably not the seller's fault (likely a manufacturer's packing mistake) but the front sight is way too tall and it's making it shoot low. I was getting pretty frustrated until I looked at the markings on the front sight and realized they sent me the wrong thing.
I picked them up online through Amazon and was told to keep them and they would refund me. Kinda crappy for the seller. I would much rather have sent them back and gotten the right one. But I have to order a front sight that's correct somewhere else.
Fortunately, if you ever need it. Ameriglo has a sight calculator for free. It confirmed that if they had sent me the correct sight it would have been dead on.