H&K P7 M10 The P7 M10 is the 40 S&W version of the 9mm P7 and PSP handguns. It has a noticeably larger slide to accommodate for the recoil of the new caliber. It has a capacity of 10+1, hence the name. No longer in production, you can still find them on the used market for around $2,000 to $3,000. One of my dream guns I want to buy, but I’d be hard pressed to use the thing regularly. Few if any aftermarket parts or supplies in case something breaks.