Ak 4
An Ak 4 with magazine removed
Type	Battle rifle
Place of origin	Sweden West Germany
Service history
In service	1964–present
Used by	See Users
Wars	War in Afghanistan
Production history
Designer	Heckler & Koch
Designed	1950s
Manufacturer	Husqvarna Vapenfabrik Carl Gustafs stads gevärsfaktori
Produced	1965–1985
Variants	See Variants
Specifications
Mass	4.1 kg (9.04 lb)
Length	1,045 mm (41.1 in)
Barrel length	450 mm (17.7 in)
Width	45 mm (1.8 in)
Height	220 mm (8.7 in) with inserted magazine

Cartridge	7.62×51mm NATO
Action	Roller-delayed blowback
Rate of fire	500–600 rounds/min
Muzzle velocity	800 m/s (2,625 ft/s)
Effective firing range	500 metres (547 yd) 200–500 metres (219–547 yd) sight adjustments 100–600 metres (109–656 yd) with optics
Maximum firing range	3,700 metres (4,046 yd)
Feed system	20-round detachable box magazine.
Sights	Rear: rotary diopter; front: hooded post

The Ak 4 (Swedish: Automatkarbin 4, English: Automatic Carbine 4) is a license-built Swedish version of the West German Heckler & Koch G3 battle rifle. It was adopted as the service rifle of the Swedish Armed Forces in 1965, replacing the bolt-action m/96 Mauser.

The initial Ak 4 incorporated some minor modifications compared to the original G3 design, including a 20 mm (0.79 in) longer buttstock, a serrated thumb groove on the bolt carrier to aid in silent bolt closure, a heavier recoil buffer for increased reliability and a 200-500m rotary diopter rear sight.^[1]

The Ak 4 was manufactured from 1965 to 1985 by both Carl Gustafs stads gevärsfaktori in Eskilstuna and Husqvarna Vapenfabrik in Huskvarna.

It was replaced as the standard-issue service rifle in 1985 by the Ak 5, a license-built version of the FN FNC, but remains in use with the Home Guard and in specialist marksman roles within the regular armed forces.

History

The Ak 4 replaced the Automatgevär m/42 rifle and Carl Gustaf m/45 submachine gun in the 1960s. In order to replace the old weapons, Sweden held a trial of new weapons including: the Belgian FN FAL, the Swiss SIG SG 510, the Swedish Carl Gustaf GRAM 63, the American M14 and the German Heckler & Koch G3. After several different types of testing the FN FAL and Heckler & Koch G3 passed the tests. Due to its durability and lower price due to modern production methods the Ak 4 version of the Heckler & Koch G3 was selected as the new standard rifle in 1964. Sweden and Heckler & Koch agreed a 15,000 round service life.^[2]^[3]

From 1965 to 1970 the Ak 4 was produced by Husqvarna and later changed to Carl Gustaf in Eskilstuna in 1970 until it was replaced by the 5.56×45mm NATO chambered Ak 5 (a version of the Belgian FN FNC), but the Ak 4 is still used in the Hemvärnet-Nationella skyddsstyrkorna (Swedish Home Guard). Sweden has supplied unmodified Ak 4s to Estonia, Latvia and Lithuania. In 1985 the Ak 4 was replaced by the Ak 5.

Variants

Ak 4: Swedish-made version of the G3A3. Many Ak 4 rifles have a windage table on the right side of the butt stock for correctly adjusting a telescopic sight for 1 metre per second (2.2 mph) and 5 metres per second (11.2 mph) crosswinds from 100–600 metres (109–656 yd) in 100 metres (109 yd) increments.
Ak 4OR: Optiskt Riktmedel, optical sight. This model is fitted with a Hensoldt Fero Z24 4×24 telescopic sight mounted via a HK claw mount.^[4] During a few years it was not issued but it is now again in use by the Hemvärnet - Nationella skyddsstyrkorna (Swedish Home Guard). The Hensoldt Fero Z24 4×24 telescopic sight for G3 rifle and STANAG claw mount assembly were developed for designated marksman use. The Fero Z24 elevation knob features Bullet Drop Compensation (BDC) settings for 100–600 metres (109–656 yd) in 100 metres (109 yd) increments.^[5]
Ak 4B: In this updated version the iron sights have been removed and replaced with an Aimpoint CS red-dot reflex sight mounted on a Picatinny rail (MIL-STD-1913). The rail is welded onto the rifle. Used by Hemvärnet - Nationella skyddsstyrkorna (Swedish Home Guard).'^[6]
Ak 4C: An updated version of the Ak 4B with a 6-position adjustable-length buttstock with a cheek support comb optimized for aiming optics use designed and manufactured by the Swedish company Spuhr i Dalby AB.^[7]^[8] 5,000 Ak 4C began being fielded in 2017 by Hemvärnet - Nationella skyddsstyrkorna ("Swedish Home Guard").
Ak 4D: An updated version of the Ak 4B with the adjustable-length buttstock of the Ak 4C but with the addition of a modular fore-end (also designed and manufactured by the Swedish company Spuhr i Dalby AB), a bipod and the Hensoldt Fero Z24 4×24 telescopic sight of the Ak 4OR mounted on a Picatinny rail (MIL-STD-1913). 400 Ak 4D will be used by the Swedish Army as a stop-gap designated marksman rifle (DMR).^[9]

Users

Estonia - Some parts of the Estonian Defence League use the Ak4 variant.^[10]^[11]
Jordan^[12]
Latvia - Ak4 variant used by National Guard.^[12]
Lithuania - Ak4 variant was used by the Lithuanian Armed Forces,^[13] Lithuanian National Defence Volunteer Forces and Lithuanian Riflemen's Union.^[14]
Sweden - Made by three manufacturers, Heckler & Koch in Germany, and under license by Husqvarna Vapenfabrik (1965–70) and Carl Gustaf Gevärsfaktori (1965–80) which was later renamed to Förenade Fabriksverken (FFV) as the Ak 4 (Automatkarbin 4).^[15] Two sub-variants are known to exist, one equipped with a rail and Aimpoint sight (Ak4 B) and the other with a 4× magnifying optic, the Hensoldt Fero Z24 4×24 (Ak 4OR). It has since been replaced by the Ak 5 (Automatkarbin 5; a modified version of the FN FNC) in the regular army. Ak 4B and Ak 4OR, some times in combination with the M203 grenade launcher, is still in use in Hemvärnet – Nationella skyddsstyrkorna, the Swedish Home Guard. About 5,000 units received a new adjustable stock from 2016. An additional 5,000 units were ordered in 2019. In December 2020, the in-house review, Tidningen Hemvärnet, announced that 1,000 extra units had been ordered, meaning every soldier in the Home Guard would receive the new adjustable stock AK4C variant before the end of 2022.^[16]