ak optic mount

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.
The Ak 4 rifles were manufactured from 1965 to 1970 by both Carl Gustafs Stads Gevärsfaktori in Eskilstuna and Husqvarna Vapenfabrik in Huskvarna. From 1970 until the end of production in 1985, they were exclusively produced in Eskilstuna.
From 1965 to 1985 the Ak 4 was the standard service rifle of the Swedish military. It continues to be in use by the Swedish Home Guard and in specialist marksman roles in the regular armed forces.

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