From Marvel Comics The Punisher Armory No 2

H&K P7 & P7M13:

“Heckler & Koch have made an almost 100%. reliable as death-and-taxes pistol. When using the correct ammo. which is 9mm 115-grain. copper-jacketed bullets. it will fire forever. I once fired 2.700 rounds through one before I knocked off for the night. And it fired another 1,000 rounds in the morning. That’s reliable. The odd front of the hand-grip is the only departure from standard gun design. alt is a little handle that you squeeze to jack the first round into the chamber. then you fire in normal semi-auto.

That’s the P7 in my DiSantis belt holster, its only drawback is that its magazine capacity is only 8. And to carry a P7 around with a round in the chamber, is to carry around a gun ready to shoot. If someone got lucky. or if I even snagged a coatrack just right — bang! So, to offset some of the lack of firepower. l carry the nearly identical P7M13, which has a mag capacity of 1 3 shots. Now were talking … that l carry in the small of my back, for it is a bit thicker in the handgrip.”

Published by Marvel Comics in The Punisher Armory No. 2, June, 1991