came out with their new 15rd Mag for the P365. I jumped on the purchase of it, and after a few weeks lead time - finally got it in hand.
I've had this in my tool belt for just about 2 weeks - and I have some thoughts.
Positives- Functionality is perfect. After a couple hundred rounds, it fed flawlessly-which is always a concern with new products in the extended mag category. Holds the same stipple pattern as the grip, and it gives you 3 extra rounds over their 12rd extended and a true full hand grip.
Negatives- Fit and finish. Sig didn't create the baseplate in a way that holds the contours of the grip on the backside. So it leaves a "step down" from frame to Mag...which causes the mag to dig into your palm - There is also a gap between the mag and the grip on both sides, causing the mag to "flex" in your hand while gripping - causing your hand to be pinched under recoil, It's very difficult to seat the mag when fully loaded, the spring is TIGHT...tighter than most, causing a lot of force to get the last 3rds seated. It also causes extra printing when carrying concealed (obviously), even with an ITW holster.
In conclusion- For $54+shipping for 3 extra rounds, I wouldn't repurchase - and would stick with the 12rd mag option.