Before the nice folks at ArmaLite developed the AR15, they invented the AR10. It ain't a .22, and ArmaLite would still be happy to sell you one!
;^)
Armalite also makes a .50 BMG.
The beauty of the AK is that Comrade Mikhail Timofeyevich was acknowledging that it was to be made in a country with mostly 19th Century manufacturing standards. You could meet his design specs without CNC and with nothing more than semi-skilled machinists.