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![And And](http://static.shoplightspeed.com/shops/609250/files/005727782/heckler-koch-h-k-model-4-22lr-32acp-25acp-380-used.jpg)
The Heckler & Koch Model 4 Pistol
by Dr. Stefan Klein and Ed Buffaloe
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- To disassemble the gun for cleaning or changing the barrel the safety must be engaged.
- Remove the magazine and open the slide. Make sure the chamber is empty. Release the slide to its forward position by pulling the trigger.
- Push the barrel release button at the front of the trigger guard. Move the slide forward and lift it from the frame.
- Separate the barrel from the slide by pushing it forward against the force of the barrel spring (the magazine baseplate may be used for this purpose).
- Disassemble the slide and barrel as described above. (The safety lever must remain in the Safe position.)
- Remove the screw that holds the breech-block faceplate and remove the faceplate itself.
- Turn the faceplate around so that the letter ‘R’ is forward. (One side is marked with “R” for rimfire and one side is marked “Z” for centerfire.)
- Guide the firing pin into the upper hole in the faceplate and reinstall the screw.
- Before inserting the .22 caliber barrel press the extractor outward with the cleaning device and hold it. (The extractor has a vertical hole drilled through it toward the rear--once you pry the extractor out far enough you can put a pin, needle, or piece of fine wire through this hole to hold the extractor out of the way.)
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![Heckler And Koch Serial Number Lookup Heckler And Koch Serial Number Lookup](/uploads/1/2/4/8/124882478/732585002.jpg)
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Patent-drawing for the safety, also showing the hammer design, Patent DE691840
- US2117826: Magazine latch mechanism, registered 20 August 1935, granted 17 May 1938. Alex Seidel.
- US2138213: Trigger and lockwork mechanism, registered 20 August 1935, granted 29 November 1938. Alex Seidel.
- US2177227: Trigger and safety mechanism, registered 20 August 1935, granted 24 October 1939. Alex Seidel.
- DE691840: Locking device for pistols, registered 21 August 1938, granted 9 May 1940. Alex Seidel. This patent was an update to the previous patent, DE673766.
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Patent-drawing for the breech block faceplate, Patent DE1205425
- DE1205425: Automatic Pistol, registered 18 February 1964, granted 18 November 1965. Alex Seidel. This patent describes the new breech block faceplate which has holes for center- and “one or more eccentric holes for guiding the striker for the use of rimfire cartridges” (see also: US3287843, BE659846, AT250219, SE301923, CH430504).
HECKLER & KOCH GMBH
OBERNDORF / N
MADE IN GERMANY
HECKLER & KOCH GMBH
OBERNDORF / N MADE IN GERMANY
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Harrington & Richardson Inc.
Worcester, Mass: USA
Made In Germany
MANUFACTURE NATIONALE D’ARMES
DE SAINT ETIENNE MAS
SACO ARL VA
or
SACO ARL VA 22201
and later
HK INC ARL VA 22201
or
HK INC Va
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HK CHANTILLY Va
Jürgen Schönbeck reports that Heckler & Koch produced 38,200 pistols between 1968 and 1984 [3]. 25,800 were sold on the civilian market. Serial numbers for these civilian guns run from 10,001 to 35,800. He also reports that the German Custom Police (Zoll) received 12,400 pistols in 7.65mm Browning between 1970 and 1974 and that some of these pistols came with .22 long rifle barrel sets for training. Serial numbers run from 40,001 to 52,400. However, a certain number of these guns were later exported to the US. They have the HK CHANTILLY Va inscription on the right side and show the word “BUND” on the frame clearly indicating that the guns were made for the German Government.