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The PPK and PP are still manufactured by Walther, but the PP went out of production between 1999 and 2024 [14] and have been widely copied. The design inspired other pistols, among them the Soviet Makarov , the Hungarian FEG PA-63 , the Czechoslovakian Vz. 50 , the American Accu-Tek AT-380 II, and the Argentine Bersa Thunder 380 .
The precombustion area is the coolest part of the flame because the amount of released energy (heat) is low. The main reaction zone is used for the surface treatment because this zone has the highest temperature and number of oxidizing agents. The flame reaches its highest temperature (1900–2000°C) when all the propane has reacted with the air.
Phosphate conversion coating is a chemical treatment applied to steel parts that creates a thin adhering layer of iron, zinc, or manganese phosphates to improve corrosion resistance or lubrication or as a foundation for subsequent coatings or painting. [1] [2] [3] It is one of the most common types of conversion coating.
The compound is dissolved in hydrocarbon-based solvents which are known to be harmless to paintings pigment layers [9] It requires a heatlining treatment that exceeds other adhesive agents' temperature and treatment length, which has necessitated the development of new techniques, such as such as "flock lining" and "drop lining". [7]
The PP-19 Vityaz (also known as the PP-19-01 "Vityaz-SN") is a 9×19mm Parabellum submachine gun developed in 2004 by Russian small arms manufacturer Izhmash. It is based on the AK-74 and offers a high degree of parts commonality with the AK-74. The gun is directly developed from the PP-19 Bizon.
PP-71 (ПП-71) - a prototype SMG developed for the Ministry of Defense in the framework of the ROC "Bouquet" and tested in 1969–1972. Not commercially produced. Not commercially produced. PP-91-01 "Kedr-B" ( ПП-91-01 «Кедр-Б» ) - SMG with an integrated silencer, chambered for 9×18mm Makarov [ 1 ]
The PP models were the first mass-produced pistols with stamped parts. Still, the overall increase in dependability and high production quality with lower relative manufacturing costs made them the best option to replace the P-08 Luger. In 1938, Nazi Germany awarded the contract for that replacement to Walther for the 9mm P38.
Various low cost .22 caliber pistols resembling the Luger pistol; KGP 68, .380 (9mm kurz) Luger pistol Clone; ESP 85A, target pistol. TP 22, .22 caliber pistols resembling the PPK. TP 25, .25 ACP variant of the TP-22 pocket pistol. ET 22, .22 caliber pistols with 11 inch barrels for the West German Navy. Ithaca Model 72 Saddlegun, in .22LR and ...