Walther PPK/S - umarex One of the most popular WALTHER pistols in the Umarex range has been improved: The Walther PPK/S with a metal slide now has a new piercing mechanism for the CO2 cartridge – it’s invisible when the gun is seen in profile. The required Allen key is part of the grip plate and is therefore always at hand. Umarex USA. WALTHER PPK/S BLACK wwwexusa›Pistols›BB Gun PistolsThe Walther PPK set the standard for concealed carry pistols for most of the 20th Century. The elegant lines give the PPK its timeless appeal. The lines of the iconic Walther are faithfully reproduced in this CO2 powered air gun. The PPK speaks to 007’s devotees, too, but there’s more than the cinematic appeal to this reproduction.