The Ak 4 (Swedish: Automatkarbin 4) is a Swedish-made version of the Heckler & Koch G3A3 battle rifle. It has been produced in several versions, with minor changes and upgrades. The original Ak 4 model (Ak 4A) featured a buttstock that is 20 mm (0.79 in) longer. The bolt carrier had a serrated thumb groove to aid in silent bolt closure and was fitted with a heavy buffer for higher number of rounds fired before failure. The Ak 4 iron sights feature extended 200–500 metres (219–547 yd) sight adjustments in 100 metres (109 yd) increments, because the 500 metres (547 yd) hit probability met Swedish military doctrine. All Ak 4s are adapted to mount the M203 grenade launcher. Later versions have featured various new optics and adjustable stocks.
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