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Heckler & Koch HK G3 Assault Rifle / Carbine / Designated Marksman Rifle / Sniper Rifle (1959)

Authored By Staff Writer | Last Updated: 2/25/2015

The German-originated Heckler and Koch HK G3 assault rifle was, and continues to be, a robust and reliable weapon system.

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At the end of World War 2, German engineers were working on perfecting a new breed of service rifle known as the "assault rifle". The assault rifle immediately antiquated the bolt-action service rifle as the standard-issue firearm of any modern army. The new weapon allowed use of a rifle-caliber cartridge in a more compact body with the capability of repeat, automatic fire at targets within short and medium ranges - ranges most often being encountered by infantry. The most famous early example of this type of weapon became the German wartime StG 44 (Sturmgewehr 44 or "Storm Rifle") - often cited as the "Father of Assault Rifles" - which led to a more refined and simpler prototype - the StG 45. Unfortunately for the Germans, the StG 45 only existed in prototype form before the end of the war in May of 1945 and perhaps as little as 30 units were produced.

The StG 45 made use of the intermediate 7.92x33mm Kurz ("short") cartridge though, perhaps most importantly, it brought about the use of the "roller-delayed blowback" firing principle. This operation essentially involved two locking rollers situated to either side of the firing pin near the base of the cartridge, engaging the sides of the receiver during the firing action and delaying the movement of the bolt head - the barrel remaining fixed in place. The principle was adopted as a cost-effective alternative to a proposed gas-operated, roller-locked breech system originally intended for the StG 45. The end of the war stymied development of the StG 45 but German engineers, having relocated to Spain after the war, began perfecting the system under the government-sponsored Centro de Estudios Tecnicos de Materiales Especiales ("Technical Studio of Special Materials") otherwise known as CETME. The engineers managed to produce a more refined and reliable roller-delayed blowback system chambered for the 7.92mm cartridge and marketed it towards the West German Army for consideration as their new standard-issue service rifle. The West German Army favored the CETME idea but preferred a weapon utilizing the 7.62x51mm NATO standard cartridge instead. CETME engineers continued their work on the design and ultimately produced the CETME "Model 58" assault rifle/battle rifle firing a reduced-charge 7.62mm cartridge (to become the 7.62x51mm CETME).

After evaluation of competing systems, the West German Army selected the CETME design as their new standard-issue assault rifle. License-production of the weapon was obtained and the firm of Heckler & Koch revised the CETME system to accept the full-power 7.62x51mm NATO cartridge. The resulting design became the HK G3 series ("Gewehr 3") automatic rifle/battle rifle series which made use of sheet metal stampings in its construction dotted by furniture manufactured of plastic. The internal firing mechanism was a much more refined form of the original StG 45 roller-delayed blowback system and the overall construction of the rifle budget-friendly. The G3 shared much with the Spanish CETME but was, for all intents and purposes, its own evolution of the Stg 45 before it - a fairly straightforward, basic unassuming rifle formally categorized as a "Battle Rifle" due to its use of a full-power rifle cartridge. The HK G3 was introduced in 1959 and became the standard-issue service rifle of the West German Army. Some early HK G3s were, however, known to feature "CETME" stamped along their receivers, at least up until 1961.

At its core, the HK G3 was a fine, if unspectacular, automatic rifle development exhibiting lines that would become a standard for the HK concern for decades to come. It yielded a very utilitarian appearance but was a fully-functional end-product worthy of the rigors of the modern battlefield. The design incorporated a solid fixed stock with an angled pistol grip near the thumb-operated fire selector (safety, semi-automatic single-fire and full-automatic fire modes). The curved trigger unit was held within a hardened trigger guard. Ahead of the trigger lay the magazine well which accepted a 20-round detachable box magazine. The magazine release catch was aft of the magazine well. The receiver largely incorporated long-running horizontal lines from front to rear. The forestock consisted of a plastic handguard shrouding a good length of the barrel which protruded a distance away and was capped with a slotted muzzle flash hider. There was a rear sighting installation atop the receiver (the identifiable "drum-type" diopter sight) with the front sight added at the extreme end of the forestock. Overall, the G3 served as a very clean, "no frills" gun design.


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Specifications for the
Heckler & Koch HK G3
Assault Rifle / Carbine / Designated Marksman Rifle / Sniper Rifle


Country of Origin: Germany
Manufacturer: Heckler & Koch GmbH (among others, see text) - West Germany / Germany
Initial Year of Service: 1959


Overall Length: 1025 mm (40.35 in)
Barrel Length: 450.00 mm (17.72 in)
Weight (Empty): 9.70 lb (4.40 kg)


Caliber*: 7.62x51mm NATO
Action: Roller-Delayed Blowback
Feed: 20-Round Detachable Box Magazine
Muzzle Velocity: 2,625 ft/sec (800 m/sec)
Rate-of-Fire: 500 rounds per minute
Range: 1,312 ft (400 m; 437 yds)
Sights: Adjustable Iron Front and Rear; Optional Optics


* Listed caliber(s) for firearms may be model dependent if more than one model type/chambering was produced. Always consult official manufacturer's information or a licensed dealer.


Variants:
G3 - Base production model with wooden buttstock; largely based on the Spanish CETME Modelo B model series.


G3A1 - Retractable buttstock

G3A2 - Rotary rear-sight

G3A3 - Final production model; Front sight modification; Improved flash suppressor.

G3A3A1 - Ambidextrous fire selector; brass ejection port deflector.

G3A3Z 'zielfernrohr' - Telescopic sights added.

G3A4 - Similar to 3A3 with collapsible stock.

G3A4A1 - Ambidextrous fire selector; brass ejection port deflector.

G3KA4 - Carbine Form of the G3; collapsible stock.

G3KA4A1 - Similar to G3KA4; ambidextrous fire selector; brass ejection port deflector.

G3A5 - Danish-produced G3A3 models

G3A6 - Iranian-produced and licensed variant.

G3A7 - Turkish-produced and licensed variant.

G3A7A1 - Turkish-produced and licensed variant of German G3A4 model.

G3A3ZF - Optics Support across upper receiver

G3SG/1 - Special accurized sniper rifle version of the G3.

HSG1 - Luxembourg-produced and licensed variant.

Gv M/75 - Leased Danish versions from German Army

AG-3 - Norwegian-produced variant

AG-3F1 - Norwegian-produced variant; collapsible stock.

AG-3F2 - Norwegian-produced variant; improved AG-3F1; Picatinny rail support; integrated foregrip.

Ak 4 - Swedish-produced variant based on G3A3.

G3P4 - Pakistani-produced variant of G3A4

DIO G3 - Iranian-produced variant in bullpup form.

G3TGS - HK79 40mm underslung grenade launhcer support.

MSG3 - Revised scope mount

PSG-1 - Dedicated sniper rifle form for police use; free-floating barrel; ergonomic comforts; semi-automatic fire only.

MSG-90 - Cost-effective military version of the PSG-1; semi-automatic fire only.

HK41 - Police/Civilian version; semi-automatic fire only.

HK91 - Civilian Version

HK911 - Revised HK91 for US civilian gun market

SR9 (T) "Target" - Revised US civilian market sporting form.

SR9 (TC) "Target Competition" - Revised US civilian market sporting form.


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