By the time you’re reading this the new Walther PDP 9mm pistols will have been announced. Designed to not just replace but be an upgrade over their flagship PPQ pistols, the optics-ready PDP is sure to get a lot of attention. There are two versions of the PDP, the 15-shot Compact, which has a four-inch barrel and is roughly the same size as the current PPQ, and the Full-Size PDP, which has a 4.5-inch barrel and a longer grip, inside which you’ll find an 18-round magazine.