I really like my P365 but the 10 round mags are too short to be easily accessible when grabbing them from a mag pouch. I also like the P365X grip length better but sometimes it's nice to have the super compact regular P365 length. So after some searching I found these MA friendly extensions which just increase the length of the floorplate but don't add extra rounds to the mag. They are slightly longer than a P365X 10/12 round mag, and slightly shorter than the 15 round mag (see below image, this was taken at my house in North Carolina). I had the opportunity to compare my p365 with this extended mag to a G43x and it's nearly identical size-wise. Really an optimal size for a CCW pistol I think, and lets you easily switch to the micro-compact form factor.