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  2. Walther PP - Wikipedia

    en.wikipedia.org/wiki/Walther_PP

    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 .

  3. Quench polish quench - Wikipedia

    en.wikipedia.org/wiki/Quench_polish_quench

    Finally, the workpiece is re-immersed into the salt quench bath for 20 to 30 minutes, rinsed, and oil dipped. This last step optimizes the corrosion resistance by creating a layer of iron oxide about 3 to 4 micrometers thick. [5] It also gives the workpiece a black finish. [3] [6]

  4. Phosphate conversion coating - Wikipedia

    en.wikipedia.org/wiki/Phosphate_conversion_coating

    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.

  5. Firearm maintenance - Wikipedia

    en.wikipedia.org/wiki/Firearm_maintenance

    Front cover – The M16A1 Rifle – Operation and Preventive Maintenance by Will Eisner, issued to American soldiers in the Vietnam War. An inadequately maintained firearm will often accumulate excessive fouling and dirt within the barrel and receiver, which not only can clog up the rifling and decrease the firearm's accuracy and precision, but can also interfere with the proper operation of ...

  6. PP-19 Bizon - Wikipedia

    en.wikipedia.org/wiki/PP-19_Bizon

    The PP-19-01 Vityaz-SN is a further evolution of the PP-19 Bizon. The Vityaz-SN is chambered in 9×19mm Parabellum, it entered Russian service in 2005, and continues to be the country's standard issue submachine gun for all military and police forces.

  7. PP-19-01 Vityaz - Wikipedia

    en.wikipedia.org/wiki/PP-19-01_Vityaz

    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.

  8. Quenching - Wikipedia

    en.wikipedia.org/wiki/Quenching

    These oil-based fluids often oxidize and form sludge during quenching, which consequently lowers the efficiency of the process. The cooling rate of oil is much less than water. Intermediate rates between water and oil can be obtained with a purpose-formulated quenchant, a substance with an inverse solubility that therefore deposits on the ...

  9. PPK - Wikipedia

    en.wikipedia.org/wiki/PPK

    PPK (trance duo), a Russian trance duo.ppk, PuTTY private key file format; Walther PPK, a variant of the Walther PP pistol; Pedro Pablo Kuczynski (born 1938), also known as PPK, former President of Peru; Personal preference kit, an allowance of personal items that an astronaut can bring on a mission