Heckler & Koch G3 Explained

Heckler & Koch G3
Origin:West Germany
Type:Battle rifle
Is Ranged:Yes
Service:1959–present
Used By:See Users
Wars:See Conflicts
Designer:CETME
Mauser
Heckler & Koch
Design Date:1950s
Manufacturer:Heckler & Koch (original)
Rheinmetall
MIC
SEDENA
Kongsberg GruppenPakistan Ordinance Factories
and others
Production Date:1958–present
Number:8,000,000
Variants:See Variants
Weight:4.382NaN2 (G3A3)
4.7kg (10.4lb) (G3A4)
Length:1025mm
Part Length:450mm
Width:45mm
Height:220mm with inserted magazine
Cartridge:7.62×51mm NATO
Action:Roller-delayed blowback
Rate:500–600 rounds/min
Velocity:800m/s
Max Range:1000m (3,000feet)
Feed:5-, 10-, 20-, 30-, or 40-round detachable box, and 50-round and 100-round drum magazine
Sights:Rear: rotary diopter; front: hooded post

The Heckler & Koch G3 (German: Gewehr 3) is a select-fire battle rifle chambered in 7.62×51mm NATO developed in the 1950s by the German firearms manufacturer Heckler & Koch, in collaboration with the Spanish state-owned firearms manufacturer CETME. The G3 was the service rifle of the German Bundeswehr until it was replaced by the Heckler & Koch G36 in the 1990s, and was adopted into service with numerous other countries.

The G3 has been exported to over 70 countries and manufactured under license in at least 15 countries. Over 7.8 million G3s have been produced. Its modular design was used for several other HK firearm models, including the HK21, MP5, HK33, PSG1, and G41.

History

The origin of the G3 can be traced back to the final years of World War II when Mauser engineers at the Light Weapon Development Group (Abteilung 37) at Oberndorf am Neckar designed the Maschinenkarabiner Gerät 06 (MKb Gerät 06, "machine carbine device 06") prototype assault rifle chambered for the intermediate 7.92×33mm Kurz cartridge, first with the Gerät 06 model using a roller-locked short recoil mechanism originally adapted from the MG 42 machine gun but with a fixed barrel and conventional gas-actuated piston rod. With careful attention to the mechanical ratios, the gas system could be omitted. The resultant weapon, Gerät 06H (the "H" suffix is an abbreviation for halbverriegelt - "half-locked") was assigned the designation StG 45(M) (Sturmgewehr 45(M), assault rifle 45) but was not produced in significant numbers and the war ended before the first production rifles were completed.

The German technicians involved in developing the StG 45(M) were taken to work in France at Centre d'Etudes et d'Armement de Mulhouse (CEAM). The StG 45(M) mechanism was modified by Ludwig Vorgrimler and Theodor Löffler at the Mulhouse facility between 1946 and 1949. Three versions were made, chambered in .30 Carbine, 7.92×33mm Kurz, and the experimental 7.65×35mm French short cartridge developed by Cartoucherie de Valence in 1948. A 7.5×38mm cartridge using a partial aluminium bullet was abandoned in 1947. Löffler's design, designated Carabine Mitrailleuse Modèle 1950, was retained for trials among 12 different prototypes designed by CEAM, MAC, and MAS. Engaged in the Indochina War and being the second NATO contributor, France canceled the adoption of these new weapons for financial reasons.

In 1950, Vorgrimler moved to Spain where he created the LV-50 rifle chambered for the Kurz cartridge and later, the proprietary 7.92×40mm CETME M53 round. At this point, the rifle was renamed the Modelo 2. The Modelo 2 drew the attention of the West German Bundesgrenzschutz (Border Guards), who sought to re-equip the newly formed national defense forces. Not willing to accept a cartridge outside of the NATO specification, the Germans asked CETME to develop a 7.62×51mm version of the rifle. The resulting CETME Model A was chambered for the 7.62×51mm CETME cartridge which was identical in chamber dimensions but had a reduced-power load compared to the 7.62×51mm NATO round. Further development of the rifle with input from H&K produced the CETME Model B which received several modifications, including the ability to fire from a closed bolt in both semi-automatic and automatic firing modes, a new perforated sheet metal handguard (the folding bipod had been the foregrip in previous models), improved ergonomics and a slightly longer barrel with a 22 mm rifle grenade launcher guide. In 1958, this rifle was accepted into service with the Spanish Army as the Modelo 58, using the 7.62×51mm CETME round.

In 1956, the Bundesgrenzschutz canceled their planned procurement of the CETME rifles, adopting the Belgian-made FN FAL as the Gewehr 1 (G1) instead. However, the newly formed West German Army (Bundeswehr) now showed interest and soon purchased a number of CETME rifles (7.62×51mm NATO chambering) for further testing. The CETME, known as the Automatisches Gewehr G3 according to German nomenclature, competed successfully against the Swiss SIG SG 510 (G2) and the American AR-10 (G4) to replace the previously favored G1 rifle. In 1956 the Bundeswehr started extended troop trials with 400 CETME rifles. Heckler & Koch made a number of changes to the CETME rifles. In January 1959, the Bundeswehr officially adopted the technically improved CETME proposal. The West German government wanted the G3 rifle to be produced under license in Germany; purchase of the G1 had previously fallen through over FN's refusal to grant such a license. In the case of the G3, the Dutch firm Nederlandse Wapen en Munitiefabriek (NWM) held production and sales rights to the CETME design outside of Spain. To acquire production rights, the West German government offered NWM contracts to supply the German Air Force (Luftwaffe) with 20mm ammunition. Production of the G3 was then assigned to Rheinmetall and Heckler & Koch.[1] The latter company already had ties to CETME, and had worked to further optimize the CETME rifle for use with the full-power 7.62×51mm NATO cartridge (as opposed to the downgraded CETME variant). In 1969, Rheinmetall gave up production rights to the G3 in exchange for Heckler & Koch's promise not to bid on MG 3 machine gun production. Later in 1977, the West German government ceded ownership of G3 production and sales rights exclusively to Heckler & Koch. After obtaining these rights, Heckler & Koch initially had to pay the government 4 Deutsche Marks per rifle, despite having been awarded the contract by the German government.

Initial production G3 rifles differed substantially from more recent models; early rifles featured closed-type mechanical flip-up sights (with two apertures), a lightweight folding bipod, a stamped sheet steel handguard, a wooden buttstock (in fixed stock models) or a telescopic metal stock. Before delivery to the Bundeswehr, each G3 went through functional checks, zeroing the sight line (Anschießen) and a shooting test at the factory. In the process, five shots were fired at a target at 100m (300feet) with particularly accurate sighting-in ammunition. The 5-shot group could not exceed 1201NaN1 (1.2 mil/4.13 MOA) diameter. The weapon was modernized during its service life (among other minor modifications it received new sights, a different flash suppressor, and a synthetic handguard and shoulder stock), resulting in the most recent production models, the G3A3 (with a fixed polymer stock) and the G3A4 (telescoping metal stock). The rifle proved successful in the export market, being adopted by the armed forces of over 40 countries. Of that figure, 18 countries undertook domestic production of the G3 under license.[2] Known manufacturers of the weapon included France (MAS), Greece (Hellenic Defence Systems), Iran (Defense Industries Organization), Luxembourg (Luxemburg Defense Technologie), Mexico, Myanmar, Norway (Kongsberg Våpenfabrikk), Pakistan (Pakistan Ordnance Factories), Portugal (FBP), Saudi Arabia (Military Industries Corporation (Saudi Arabia)), Sweden (Husqvarna Vapenfabrik AB and FFV Carl-Gustaf in Eskilstuna), Thailand, Turkey (MKEK) and the United Kingdom (Royal Ordnance).

The Bundeswehr was working on improving their G3 rifles in the 1990s with a brass deflector that deflects spent cartridge cases down and frontwards from the operator and a new polymer pistol-grip/fire-control assembly module that allows better ambidextrous operation of the safety lever when they had their G3 rifles replaced for the Heckler & Koch G36. Currently (2018) hundreds of thousands of G3A3A1, G3A4A1 and G3KA4A1 modernized variants rifles are maintained by Bundeswehr personnel and kept in reserve or are available in military base small arms storages.

Design details

Operating mechanism

The G3 is a selective-fire automatic weapon that employs a roller-delayed blowback operating system. The two-piece bolt assembly consists of a breech (bolt head) and bolt carrier. The bolt is held in battery by two sliding cylindrical rollers that engage locking recesses in the barrel extension. The breech is opened when both rollers are compressed inward against camming surfaces driven by the rearward pressure of the expanding gases upon the bolt head. As the rollers move inward, recoil energy is transferred to the locking piece and bolt carrier which begin to withdraw while the bolt head slowly moves rearward in relation to the bolt carrier. As the bolt carrier clears the rollers, pressure in the bore drops to a safe level, the bolt head is caught by the bolt carrier and moves to the rear as one unit, continuing the operating cycle.

Based on the geometric relationship arising from the angles of the roller contact surfaces of the locking piece and the barrel extension recesses, the recoil of the bolt head is delayed by a ratio of 4:1 for the 7.62×51mm NATO chambering. Thus during the same period of time, the bolt head carrier moves 4 times faster than the bolt head. This ratio is continued until the locking rollers have been withdrawn from the barrel extension recesses.

The bolt features an anti-bounce mechanism that prevents the bolt from bouncing off the barrel's breech surface. The "bolt head locking lever" is a spring-loaded claw mounted on the bolt carrier that grabs the bolt head as the bolt carrier group goes into battery. The lever essentially ratchets into place with friction, providing enough resistance to being re-opened that the bolt carrier does not rebound. The spring-powered claw extractor is also contained inside the bolt while the lever ejector is located inside the trigger housing (actuated by the recoiling bolt).

The chamber has longitudinal gas relief flutes cut in the chamber wall to ease the cartridge case's extraction upon firing. These flutes allow propellant gas to flow between the case and chamber wall, equalizing the pressure between the inner and outer surfaces of the front of the cartridge case. The intentional propellant gas ingress at the gas relief flutes significantly reduces case friction against the chamber wall, making extraction more reliable by preventing the cartridge case from sticking and tearing.

The reliable functioning of roller-delayed blowback mechanisms is limited by specific ammunition and arm parameters like bullet weight, propellant charge, barrel length and amount of wear. For obtaining a proper and safe functioning parameters bandwidth Heckler & Koch offer a variety of locking pieces with different mass and shoulder angles. The angles are critical and determine the unlock timing and pressure curve progression as the locking pieces act in unison with the bolt head carrier.[3] [4]

Features

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.[5] [6]

Trigger

The rifle is hammer fired and has a trigger mechanism with a 3-position fire selector switch that is also the manual safety toggle that secures the weapon from accidentally discharging (fire selector in the "E" or "1" position – single fire mode (Einzelfeuer), "F" or "20" – automatic fire (Feuerstoß), "S" or "0" – weapon is safe (Sicher), trigger disabled mechanically). The weapon can be fitted with an optional four-position safety/fire selector group illustrated with pictograms with an ambidextrous selector lever. The additional, fourth selector setting enables a three-round burst mode of fire. The rifle has a relatively high trigger pull of 50- due to a drop safety requirement. An interchangeable set-trigger pack assembly featuring a trigger stop and less trigger pull is available for the G3SG/1 and other sniping orientated variants.

Sights

The original G3 and G3A1 rifle variants had a relatively low iron sight line that consisted of a Klappvisier, an "L-type" flip up rear sight and hooded front post.From the G3A2 variant the firearm is equipped with a relatively low iron sight line that consists of a Drehvisier a rotary rear drum and hooded front post. The rear sight is mechanically adjustable for both windage and elevation with the help of tools. This deliberately prevents non-armorers to (re)zero the iron sight line. The rotary drum features an open V-notch (numbered 1) for rapid target acquisition, close range, low light and impaired visibility use and three apertures (numbered 2, 3 and 4) used for: 200- in 100m (300feet) increments for more precise aiming. The 1 V-notch and 2 or 200m (700feet) aperture settings have an identical point of aim. The V-notch and apertures are calibrated for US M80 / German DM111 series or other equivalent 9.5g 7.62×51mm NATO ball ammunition. The receiver housing has recesses that work with STANAG claw mounts/HK clamp adapters used to mount day or night aiming optics.

Barrel

The rifled barrel – four right-hand grooves with a 305mm twist rate to adequately stabilize the military 7.62×51mm NATO ammunition of the era – terminates with a slotted flash suppressor which can also be used to attach a bayonet or serve as an adapter for launching rifle grenades. From the G3A3 the barrel was free floated from the stock and had polygonal rifling. The barrel chamber is fluted with twelve flutes, which assists in the initial extraction of a spent cartridge casing (since the breech is opened under very high barrel in internal cartridge case pressure).

Feeding

The G3A3 (A4) uses either steel (260 g) or aluminium (140 g) 20-round double-stacked straight box magazines, or a 50-round drum magazine. H&K developed a prototype plastic disposable magazine in the early 1960s, but it was not adopted as aluminum magazines were just as light and proved more durable, as well as easier to produce.

Accessories

Standard accessories supplied with the rifle include: a detachable bipod (not included with rifles that have a perforated plastic handguard), sling, cleaning kit and a speed-loading device. Several types of bayonet are available for the G3, but with few exceptions they require an adapter to be inserted into the end of the cocking tube. The most common type features a 6 inch spear-point blade nearly identical with the M7 bayonet, but with a different grip because of its mounting above the barrel. The weapon can also mount a 40 mm HK79 under-barrel grenade launcher, blank firing adapter, a straight blowback bolt (called a "PT" bolt, lacks rollers) used for firing 7.62×51mm ammunition with plastic bullets, a conversion kit used for training with .22 Long Rifle ammunition and a sound suppressor (that uses standard ammunition).

Variants

The G3 served as a basis for many other weapons, among them: the PSG1 and MSG90 precision rifles, the HK11 and HK21 family of light machine guns, a semi-automatic version known as the HK41, a "sporterized" model called the SR9 (designed for the civilian market in countries where the HK91 would not qualify, primarily the US after the 1989 importation restrictions) and the MC51 carbine.

Models made under license

The G3 rifle is or was produced under license in the following countries: Pakistan, Brazil, Iran, France, Greece, Norway, Mexico, Myanmar, Portugal, Saudi Arabia, Sweden and Turkey.

The Pakistani manufacturer, Pakistan Ordnance Factories (POF) uses the same model number for both automatic versions as well as versions of different manufacturing that are made as semi automatic for the civilian market. POF's definition of the civilian versions are "Semi Auto Irreversible".[7]

Other military variants and derivatives

Denmark

Myanmar

Norway

Sweden

See main article: Automatkarbin 4.

Iran

Pakistan

The Pakistani models are manufactured in both automatic and civilian semi automatic versions sharing the same model number.[7]

United Kingdom

Specialized G3 types

Law enforcement and civilian models

Other manufacturers

Users

Active

Iranian and Turkish-made G3s[29]

Starting in 1962, it was made in Portugal under license by the Fábrica do Braço de Prata. The Portuguese Marine Corps use a modernized version of the G3A3/A4 with kit Spuhr and Aimpoint CompM4 red dot sight.[52]

Made under license by Makina ve Kimya Endüstrisi Kurumu (MKEK) ("Mechanical and Chemical Industry Corporation") as the G3A7 and G3A7A1. A local version called the M65 was produced between 1966 and 1983. During the 1980s it was gradually replaced by the M79, a locally produced version of the HK-33 assault rifle.[62]

Former

G3A3 and A4 versions. The G3 was the standard-issued rifle of the Portuguese Army from 1963-2020, manufactured under license by Fábrica de Braço de Prata before it shut down. In 2019, it was replaced by FN SCAR L rifles.[69]

Non-state users

Conflicts

1960s

1970s

1980s

1990s

2000s

2010s

2020s

References

Notes
Bibliography

External links

Notes and References

  1. Web site: Rheinmetall G3. May 12, 2019. https://web.archive.org/web/20230522081742/https://armourersbench.com/2019/05/12/rheinmetall-g3/. May 22, 2023. The Armourer's Bench.
  2. Book: Bourne, Mike. Arming Conflict: The Proliferation of Small Arms. limited. 2007. 66–67. Palgrave-Macmillan. Basingstoke. 978-0-230-01933-1.
  3. Web site: How Does It Work: Roller Delayed Blowback. 17 March 2020 . www.youtube.com. https://web.archive.org/web/20221120103728/https://www.youtube.com/watch?v=sd8FrUe8fMM. November 20, 2022. November 20, 2022. bot: unknown.
  4. Web site: How Roller-Delayed Firearms Work and Why it Matters. Nathan. Thornton. October 12, 2019. International Sportsman. https://web.archive.org/web/20230326164023/https://www.internationalsportsman.com/how-roller-delayed-firearms-work-and-why-it-matters/. March 26, 2023.
  5. Book: Tilstra, Russel. The Battle Rifle: Development and Use Since World War II. McFarland & Company, Inc.. 2014. 978-1-4766-1564-6.
  6. Web site: G3 Armorer's Manual Instructions for Maintenance and Repair Cal. 7.62 mm × 51, page 8. https://web.archive.org/web/20221030192710/http://pdf.textfiles.com/manuals/FIREARMS/hk_g3.pdf. October 30, 2022.
  7. Web site: Public sector organizations. depo.gov.pk. 9 April 2024.
  8. The military rifle cartridges of Burma/Myanmar. Paul. Scarlata. Shotgun News. May 2012. 2018-11-27. https://web.archive.org/web/20181128075329/https://www.thefreelibrary.com/The+military+rifle+cartridges+of+Burma%2FMyanmar.-a0288876068. 2018-11-28. live.
  9. Web site: "My Gun Was as Tall as Me" . 2018-07-25 . https://web.archive.org/web/20081020114157/http://www.hrw.org/reports/2002/burma/Burma0902.htm . 2008-10-20 . live .
  10. https://www.researchgate.net/profile/Maung_Myoe/publication/272092747_Building_the_Tatmadaw/links/54dac5d50cf2ba88a68de69a/Building-the-Tatmadaw.pdf Building the Tatmadaw
  11. Web site: Burmese Small Arms Development . 26 August 2009 . 2018-07-25 . https://web.archive.org/web/20180715210629/http://www.smallarmsreview.com/display.article.cfm?idarticles=1154 . 2018-07-15 .
  12. Web site: "Strong and Fast": German Arms in Burma . 2018-07-25 . https://web.archive.org/web/20181005121730/http://www.bits.de/public/articles/kleinwaffen-nl11-07eng.htm . 2018-10-05 . live .
  13. Web site: B. Eric. 2020. Norwegian Home Guard Gets More HK416s and MP7s as AG-3 is Phased Out. The Firearm Blog. https://web.archive.org/web/20230204091724/https://www.thefirearmblog.com/blog/2020/10/19/norwegian-home-guard-get-more-hk416-and-mp7-as-the-ag-3-is-phased-out/. February 4, 2023.
  14. Kjellgren, G. L. M. . The Practical Range of Small Arms. https://web.archive.org/web/20150305142959/http://www.krtraining.com/KRTraining/Archive/PracticalRangeSmallArms.pdf . 5 March 2015 . The American Rifleman . 40–44. live.
  15. Web site: The SAS G3 - Heckler & Koch MC51 -. May 29, 2019. https://web.archive.org/web/20211205012017/https://www.thefirearmblog.com/blog/2019/05/29/potd-heckler-koch-mc51/. December 5, 2021.
  16. Web site: Fero Z24 4×24 telescopic sight for G3 rifle instruction manual. 25 March 2018. https://web.archive.org/web/20160823233055/http://www.drzero.org/cetme/pdf/g3sm.pdf. 23 August 2016. live.
  17. Web site: Instructions for Use of the Zeiss Diavari-DA 1.5 - 6 Riflescope for the G3 Rifle. 25 March 2018. https://web.archive.org/web/20180123131614/http://www.hkpro.com/forum/attachments/hk-long-gun-talk/32863d1435244916-hk-sg1-zeiss-diavari-da-1-5x6-info-zeiss_diavari_da.pdf. 23 January 2018. live.
  18. Web site: H&K G3 SG/1, .308 - - Historic Arms Corporation. 25 March 2018. https://web.archive.org/web/20180326165815/http://historicarmscorp.com/machine-guns/hk-g3-sg1-308/. 26 March 2018.
  19. Web site: G3SG1. Administrator. www.hkpro.com. 25 March 2018. https://web.archive.org/web/20180124070620/http://www.hkpro.com/index.php?option=com_content&view=article&id=97:g3sg1&catid=10:the-sniper-rifle. 24 January 2018. live.
  20. February 20, 2019. HK-32 Prototype in 7.62x39mm. Forgotten Weapons. YouTube. July 17, 2023. https://web.archive.org/web/20230717044009/https://www.youtube.com/watch?v=sJSuSQrDd7k. July 17, 2023. bot: unknown.
  21. Web site: [SHOT 2020] New PTR-91 HK91/G3 Style .308 Rifles from PTR -]. January 29, 2020. https://web.archive.org/web/20221129142507/https://www.thefirearmblog.com/blog/2020/01/29/ptr-91/. November 29, 2022.
  22. Web site: HK Tutorial: Build a JLD PTR-91 HK Clone – Arizona Response Systems . www.arizonaresponsesystems.com . 6 June 2022 . https://web.archive.org/web/20201030173046/https://www.arizonaresponsesystems.com/tutorial-build-a-jld-ptr-91-hk-clone/ . 30 October 2020 .
  23. Web site: Review: Century Arms C308 . 28 May 2015. https://web.archive.org/web/20200807053818/https://www.tacretailer.com/gear/rifles/review-century-arms-c308. August 7, 2020 .
  24. Web site: Greatest Springfield Armory Imports. Elwood. Shelton. May 12, 2020. Gun Digest. https://web.archive.org/web/20221130044713/https://gundigest.com/article/greatest-springfield-armory-imports. November 30, 2022.
  25. Web site: Heckler and Koch G3 BattleRifles: Still the main squeeze... overseas (VIDEO). Guns.com. https://web.archive.org/web/20230117134020/https://www.guns.com/news/2014/03/15/heckler-koch-g3-battlerifle. January 17, 2023.
  26. https://web.archive.org/web/20221025155505/http://schwabenarmsgmbh.de/index_htm_files/Testbericht%20Caliber%20Ausgabe%205-2013%20SAR%20M41%20SPORTMATCH%20MF3.pdf Rock & Roll: Vergleichstest von 4 zivilen Selbstladegewehren auf HK G3-Basis in .308 Winchester
  27. Web site: New rifle from MKE. MPT-76 in 7,62x51 NATO and the MP5 clones at IWA - . 9 June 2016 . https://web.archive.org/web/20230128173549/https://www.thefirearmblog.com/blog/2016/06/09/new-rifle-mke-mpt-76-762x51-nato-mp5-clones-iwa/. January 28, 2023.
  28. https://web.archive.org/web/20151106160834/http://www.waffen-pfandleihhaus.de/beschreibungen/1560.html Pistole Mauser Mod 1914 Kal. 7,65mm WB1560
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  32. Web site: 2017-07-05 . Rio's Civil Police in Action and Pics - . 2022-11-22 . The Firearm Blog . en-US. https://web.archive.org/web/20221201211737/https://www.thefirearmblog.com/blog/2017/07/05/rios-civil-police-action-pics/. December 1, 2022.
  33. Web site: 2017-08-22 . Photo report: joint Police/Armed Forces operations in Rio - . 2022-11-22 . The Firearm Blog . en-US. https://web.archive.org/web/20221127045350/https://www.thefirearmblog.com/blog/2017/08/22/photo-report-joint-policearmed-forces-operations-rio/. November 27, 2022.
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