Heckler & Koch G3 - Variants

Variants

Apart from the G3A3 and G3A4 HK also built: the G3A3ZF (essentially a G3A3 with a Hensoldt 4×24 optical sight), the accurized G3SG/1 rifle (hand-selected G3A3s, equipped with an improved trigger, Zeiss telescopic sight with a variable 1.5–6× magnification and a cheek riser) and the G3K carbine which uses an HK33 handguard and a short barrel (reduced in length to the base of the front sight post), that is too short for use with a bayonet or rifle grenades.

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 HK91, 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, produced by the UK firm FR Ordnance International Ltd. for special forces. The MC51 weighs 3.1 kg (6.8 lb), has a folded overall length of 625 mm (24.6 in), a barrel length of only 230 mm (9.1 in), which produces a muzzle velocity of approx. 690 m/s (2,263.8 ft/s) and a muzzle energy of 2215 J. The MC51 was allegedly manufactured for the British SAS and SBS, who required a compact but powerful weapon, for situations in which the stopping power and armor piercing capabilities of 9×19mm Parabellum round were inadequate. Only 50 weapons were produced, and all were reportedly shipped to the UK special forces. Most of them were soon replaced by the Heckler & Koch HK53 carbine. Another UK-based company called Imperial Defence Services Ltd. absorbed FR Ordnance and continues to market the MC51 standard variant.

• G3: Original model based on the CETME Modelo B.
• G3A1: G3 with a single position, collapsible stock. This design was chosen after earlier experimentation with a ventrally-folding stock. Excessive recoil caused the latter to be dropped from consideration.
• G3A2: G3 with new rotating drum rear sight.
• G3A3: The most well known version. Drum sights, a fixed plastic buttstock, and a plastic handguard that does not contact the barrel. The handguard came in a slim, ventilated version and a wide version. The latter allows for the attachment of a bipod.
• G3A3A1: This is a version of the G3A3 with an ambidextrous trigger group and brass deflector. This is an official German Army designation, not an HK factory one.
• G3A4: The G3A4 uses drum sights and a single position, collapsible stock. This rifle could also be issued with a scope with the nomenclature G3A4ZF. The ZF stands for Zielfernrohr or "Telescope".
• G3A4A1: This is a variant of the G3A4 with an ambidextrous trigger group and brass deflector. This is an official German Army designation, not an HK factory one.
• G3KA4: Smallest of the line, it is a Karabiner, or carbine version of the G3. It features drum sights, a retractable stock, and a 315 mm (12.4 in) barrel.
• G3KA4A1: Variant of the G3KA4 with an ambidextrous trigger group and brass deflector. This is an official German Army designation, not an HK factory one.
• G3A5: HK assigned model number for the HK-made Danish version of the G3A3. It differs in that it has a silent bolt-closure device. In Danish service it is known as the Gv M/66. The Gv M/66 was originally intended for use with optics as a designated marksman rifle, while the rest of the squad were issued M1 Garands.
• G3A6: HK assigned model number for the Iranian-made version of the G3A3.
• G3A7: HK assigned model number for the Turkish-made version of the G3A3.
• HSG1: HK assigned model number for the Luxembourg- made version of G3A3.