page_title: Heckler & Koch G3
section_title: Features
hierarchical_section_title: Heckler & Koch G3 / Design details / Features
caption_attribution_description: English: Heckler &amp; Koch rotating drum sight line pictures. The red help lines denote how to correctly center the front post. Left; V-notch and hooded front post aligned for rapid target acquisition, close range, low light and impaired visibility use. Right; aperture and hooded front post aligned for a user selectable range setting on battle rifles or assault rifles. The rotating drum sight apertures on Heckler &amp; Koch sub machine guns have various diameter apertures to optimize the sight line for various ambient light conditions instead of ranges. The theory of operation behind the aperture sight is often stated that the human eye will automatically center the front sight when looking through the rear aperture, thus ensuring accuracy. An additional benefit to aperture sights is that smaller apertures provide greater depth of field, making the target less blurry when focusing on the front sight.
context_page_description: The G3 is a 7.62×51mm NATO, select-fire battle rifle developed in the 1950s by the German armament manufacturer Heckler & Koch in collaboration with the Spanish state-owned design and development agency CETME.
context_section_description: The G3 is a modular weapon system. Its butt-stock, fore-stock and pistol-grip/fire-control assembly may be changed at will in a variety of configurations (listed below). Simple push-pins hold the components in place and removing them will allow the user to remove and replace parts rapidly.
  The weapon made extensive use of cost-saving pressed and stamped steel components rather than machined parts and spot welding to connect parts. The stamped sheet metal cocking handle tube and receiver are large exposed parts that are prone to deformation from hard impact as they were designed to be relatively thin to save weight. If dented severely or deep enough during field service reliability problems due to internal parts movement impairments can occur that put the rifle out of action and can not be field solved by the user. To determine and correct such situations armorers are trained to employ specially designed “GO” and symmetry gauges and straightening mandrels to fairly quickly repair such problems.
caption: Drehvisier rotating drum sight pictures
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