Origin
Russia
The Makarov pistol or PM (Russian: Пистолет Макарова, Pistolet Makarova, literally Makarov's Pistol) is a Russian semi-automatic pistol. Under the project leadership of Nikolay Fyodorovich Makarov, it became the Soviet Union's standard military and police side armfrom 1951 to 1991. The Makarov pistol was adopted by the Soviet Union in 1951, following a competition created to replace the obsolete Tokarev TT-33 semi-automatic pistol and Nagant M1895 revolver. Rather than building a pistol to an existing cartridge in the Soviet inventory, Nikolai Makarov took up the German wartime Walther "Ultra" design, fundamentally an enlarged Walther PP, utilizing the 9×18mm Makarovcartridge designed by B.V. Semin in 1946. For simplicity and economy, the Makarov pistol was of straight blowback operation, with the9×18mm Makarov cartridge being the most powerful cartridge it could safely and practically fire. The Luftwaffe had rejected this pistol design some years before because of its poor accuracy. Although the nominal calibre was 9.0 mm, the actual bullet was 9.22 mm in diameter, since caliber in Russia is measured between the grooves and not the lands of the rifling. Being shorter and wider, the 9mm Makarov cartridge is thus incompatible with pistols chambered for 9×19mm Parabellum cartridges and vice-versa. In 1951, the PM was selected because of its extreme reliability, simplicity, and ease of manufacture over other competing designs. It remained in wide front-line service with Soviet military and police until and beyond the end of the USSR in 1991. Variants of the pistol remain in production in Russia, China, and Bulgaria. In the U.S., surplus Soviet and East German military Makarovs are listed as eligiblecurio and relic items by the Bureau of Alcohol, Tobacco, Firearms and Explosives, because the countries of manufacture, the USSR and the GDR, no longer exist.

Girls' Frontline
Girls' Frontline is a mobile strategy game developed by MICA Team, a Chinese company. It is a moe anthropomorphism game in which the player controls echelons of characters, each of which are based on actual guns. The game was released in Mainland China on 20 May 2016, and in Hong Kong and Taiwan on 18 January 2017. It was also released in South Korea on 30 June 2017. The English version published by SUNBORN Network Technology was released on May 8, 2018. This game is a prequel of another game developed by the same company called Bakery Girls.