H&K P7M13 I didn’t put custom on this one because some P7M13’s were sold in a nickel finish from H&K. The M13 designation is for the capacity. It has a double stack 13 round magazine. H&K was going to design and release a .45 ACP version of the P7 but the costs were too high and the project was scrapped. The M13’s cost far more than a regular P7; prices ranging from $1,500 to $3,000.