Smith&Wesson factory 10 round M&P40 Compact .40 S&W or .357 Sig with the finger grip.
Another option for the M&P Compact is to use
the set up below. If you want to get the larger capacity of the full
sized magazines and or to increase the size of the grip to that of the
full sized M&P.
Now you can use the full sized M&P magazines in the M&P Compact giving you 5 more rounds of capacity. Below is some information on the X-Grip and I have more information in the X-Grip section.
Size of a Compact, Capacity of a Full-Size
The patent pending XGRIP adapts the full-size M&P 15 or 17 round magazines for use in the compact pistol, incorporating the larger magazine into the compact's grip, increasing the capacity by 5 additional rounds of ammunition. Law enforcement and military personnel can carry the compact with a standard magazine when concealment is important, then insert the high capacity magazine with XGRIP when firepower and capacity become critical.