HK P7 Semi-Automatic Pistol - Step By Step Disassembly & Reassembly

TheGreenLing
TheGreenLing
604 بار بازدید - 4 سال پیش - The P7 is a German
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").
Prompted by the 1972 Munich Olympics Massacre, the German police decided to replace the .32 ACP Walther PP with a similarly sized but more effective 9×19mm Parabellum pistol. 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 (both holstered and concealed in a pocket), and able to be quickly drawn and instantly ready to fire.
The P7 is a semi-automatic blowback-operated firearm. It features a unique gas-delayed blowback system modeled on the Swiss Pistole 47 W+F (Waffenfabrik Bern) prototype pistol (and ultimately on the Barnitzke system first used in the Volkssturmgewehr 1-5), which used gas pressures from the ignited cartridge and fed them through a small port in the barrel (in front of the chamber) to retard the rearward motion of the slide. This is accomplished by means of a piston contained inside a cylinder located under the barrel that opposes the rearward motion of the slide until the gas pressure has declined—after the bullet has left the barrel—hence allowing the slide to end its rearward motion, opening the breech and ejecting the empty cartridge case.
The chamber has 18 flutes that aid in the extraction process by allowing combustion gases to flow between the fired case and the chamber walls, preventing the case from "sticking" to the chamber walls. The drawback of this system is that the breech "opens" slightly prematurely to allow the slide to initiate its rearward motion. The high temperature gases cycling through a tube located below the chamber area and above the trigger made the early versions of this pistol uncomfortable, according to some, to shoot after the content of two magazines were fired due to heating. The advantages of this system are a simpler manufacturing process due to the absence of a locking system and a high mechanical accuracy due to the barrel being fixed in the frame; the barrel does not execute any sort of lateral or vertical movement during the operating cycle as with the Browning cam-action systems common to many other locked breech pistols.
The P7's spring extractor is contained within the slide, while the fixed ejector is a surface on the slide catch.
The grip of this pistol features a built-in cocking lever located at the front of the grip. Before the pistol can be fired, this lever must be squeezed; thus this lever acts as a safety. The pistol is striker fired. Squeezing the cocking lever with a force of 70 N (15.7 lb) cocks the firing pin. Once fully depressed, only 2 pounds of force are required to keep the weapon cocked. The weapon is then fired by pressing the single stage trigger rated at approximately 20 N (4.5 lb) As long as the lever is depressed, the weapon fires like any other semi-automatic pistol. If the lever is released, the weapon is immediately de-cocked and rendered safe. This method of operation dispensed the need for a manual safety selector while providing safety for the user carrying the pistol with a chambered round, and increased the speed with which the pistol could be deployed and fired.
The P7 is fed from a single-stack box magazine with a capacity of 8 rounds, which is held inside the firearm's frame with a release located at the heel of the grip. After the last round has been fired, the slide will remain open thanks to a slide catch that can be released by pulling the slide further back or pressing the squeeze cocker.
The firearm uses a fixed, polygonal rifled barrel (hexagonal with a 250 mm twist rate) and a fixed notched iron sight with contrast dots that enable shooting in low-level lighting conditions. The pistol is completely ambidextrous and two-handed use is enhanced through the use of a profiled and enlarged trigger guard.
Between 1982–1983 the P7 received several modifications, mainly to address American market demand and shooter preferences. These modifications resulted in the P7M8 model. A new magazine release lever (available on both sides of the frame) was installed just beneath the trigger guard, which forced designers to modify both the pistol's frame and magazine. The trigger guard was equipped with a synthetic heat shield that protects the shooter from excessive heating and a lanyard attachment loop was added in place of the previous magazine heel release. The firing pin and its bushing were also changed.
4 سال پیش در تاریخ 1399/05/05 منتشر شده است.
604 بـار بازدید شده
... بیشتر