Sako ARGThe Sako ARG is a Finnish family of assault and battle rifles designed and manufactured by Sako.WWW Official SiteBackgroundPreviously known as the K22, the ARG was designed along with the Finnish Defence Forces and the Swedish Armed Forces.DesignThe ARG is based on the AR-10 and AR-15 design by Eugene Stoner but features a proprietary short-stroke gas piston system, similar to Heckler & Koch HK416 and other piston versions of AR-15-type assault rifles.VariantsARG brandingARG 40 GPAssault rifle variant featuring short-stroke gas piston.ARG 40 DIVariant featuring direct impingent operation.ARG 50 GPDesignated marksman rifle variant.Military variantsAutomatkarbin 24Swedish variants.Users*