Nothing new, that probably hasn't already be reported. Got to take mine to the range. Only had time for 100 rounds. Barely got her warm.
First: Good sights. Nice sized white dots. Probably the best set of 3 dots I've seen. Now I also know that sights are easily replaceable so they really aren't a buy/no-buy deal breaker on any gun. Kinda like paint when buying a house. But for the record these are quite nice.
Second: The magazine only has witness holes for 5, 10 & 17 rounds. Really? Glock has them for every round, though they're hard to read. S&W M&Ps are so much better with easily readable holes on either side. Okay, I realize that an "Operator" just wants to know if they're full, half or near empty. But most of us, I think, would be happier to be able to get an exact count.
Weight and Heft: I've been dry firing and comparing the 320 with the G17 and M&P all week and thought the SIG was top heavy. So I took all three apart and weighed them. Now remember the G17 is an inch longer barrel and the M&P is about 1/4-1/2" longer.
The Sig has the lightest slide and barrel of the three which makes sense because it's the shortest. But it also has the the heaviest grip/action ! (All three are 17 round mag length.) So why does it feel top heavy? Maybe it's not top heavy as much as it's FRONT heavy, as in it has a more forward COG. I'll do some more testing. Oh and the grip is hand filling. It's 5.5" circumference for the third finger.
Oh, yes, shooting. Smooth. Great feel. Same recoil as my M&P. Less spongy trigger than the M&P. Accuracy was better than the G17, but not quite what I could do with the M&P. It was a short test.
Overall, shooting the G17 is like driving a stripped 68 VW Thing. The Sig and S&W are more like an Impala.
I'm very happy I took my "free" Glock and traded it in on the P320. It'll be my iron sight IDPA SSP (if it fits the box) and the M&P Core will be the optic one.