I took the new pistola to Top Brass here in town this afternoon. That was a mistake. It must have been 85* in there. Well it went like this. I racked the slide for the first time with a loaded mag in the gun. It didn't fully chamber. Pushed the slide into battery and sent one downrange. Same thing, round didn't fully chamber. That didn't happen anymore. I sent 73 more round down range without a problem. The sights are designed to hold on the target center, not the 6:00 hold. I used the center, AKA combat sight picture but I was still hitting low. Part of that could have been the constant wiping of sweat off my brow making it hard to concentrate fully on my shooting. I took 75 rounds of WWB ball ammo and another 50 of Federal with me but after I went through the Winchester I said screw it. Too damn hot in there. The dots on the rear sight are smaller than and less bright than the front dot which may have also been part of my problem shooting low. I think some night sights are gonna be in my future. I can replace these with any sight that fits the Sig 220 series. The slide will also close by itself when firmly seating a loaded mag. From what I've read it's made to do that. I wasn't ready for that but fortunately I was using both good muzzle and trigger discipline.