Скачать или смотреть How an HK P7 works

The P7 is a German 9×19mm semi-automatic pistol designed by Helmut Weldle and produced by Heckler & Koch GmbH (H&K) of Oberndorf am Neckar. It was revealed to the public for the first time in 1976 as the PSP (Polizei-Selbstlade-Pistole—"police self-loading pistol").

The decision to equip West German police with an advanced 9mm service pistol and replace existing 7.65mm Browning-caliber weapons was prompted after the 1972 Munich Olympics Massacre. The new firearm was to meet the following requirements: chamber the 9×19mm Parabellum cartridge, weigh no more than 1,000 g (35 oz), the pistol's dimensions would not exceed 180 × 130 × 34 mm, it should have a muzzle energy of no less than 500 J and a service life of at least 10,000-rounds. The pistol was also to be fully ambidextrous, safe to carry with a loaded chamber and able to be quickly drawn and ready to fire instantly. As a result of a competitive bid the German police forces selected three different pistols into service: the Swiss SIG Sauer P225 (designated the P6) and two German designs—the P7 (officially designated the PSP) and the Walther P5.

https://en.wikipedia.org/wiki/Heckler...

HK P7: full disassembly & assembly
   • HK P7: full disassembly & assembly  

Don't try to recreate what you see in this video, as this is gameplay. This video was created using the game World of Guns:
http://store.steampowered.com/app/262...
This game is also available on Google Play, App Store, Amazon and other platforms.