Automatkarbin 4

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The Automatkarbin 4 (Ak 4; lit. '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 self-loading automatgevär m/42 and the automatic rifles Kulsprutegevär m/21, Kulsprutegevär m/40. 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 rotary diopter rear sight with four apertures (numbered 2, 3, 4 and 5) used for: 200–500 metres (219–547 yd) in 100 metres (109 yd) increments. 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.