Early prototypes mostly still had a lug for the attachment of a shoulder stock and a full-auto trigger assembly, the very first original P9 even featuring an external hammer. The first functional test sample was produced in Oberndorf as early as 1966. 52 or the rare Korriphila HSP 701 pistol. Apart from the P9/P9S, however, rollers as a locking element can also be found on the Czech vz. Polygonal barrels are still found today in pistols from various manufacturers, but stamped frames or slides are not, and locking rollers have never been a priority for many pistol manufacturers. At that time, the new pistols from Oberndorf were characterized by three features: the barrel with polygonal profile, the cold stamping of essential parts with no machining and, of course, the roller delayed blowback system, similar to the system used in the Heckler & Koch G3. Except for the tradition double action, the P9S did not differ significantly from the pure single action P9 model. Instead, the P9S variant was launched in 1970, whose production did not end until 1995. However, the P9 was not particularly successful, because nine years later manufacturing ended after only 510 units. When the first roller delayed system pistols went into production at Heckler & Koch in 1969, the gun was still called the P9. The trigger guard also formed the front strap of the Slide and frame of the HK P9S were made from pressed steel, the polygonalīarrel was hammer-forged.