The well-tuned Walther Pro-X PMM is able to function reliably with a variety of low-velocity, standard and +P 9 mm Luger loads using just the standard recoil-spring assembly. (l.) The PDP Pro-X PMM Full-Size is 3.4 ozs. Using the Walther PDP Pro-X PMM Full-Size and Holosun 507 Comp red-dot, the author placed five shots on this silhouette target at a distance of 60 yards. In all, I fired about 2,000 rounds through the Pro-X PMM; there were no stoppages or bobbles. In fact, with their combination of recoil attenuation and match triggers—paired with the familiar PDP-platform controls—the new Walther PDP Pro-X PMMs almost make for an unfair advantage.