A reader, Nooky, posted this photo of the prototype 7.62x39mm SIG550 that Swiss Arms developed a few years ago but never put into production.
Gun Blobber posted this photo comparing an AK bolt with a SIG550 bolt …
As you can see, very similar. Nooky also posted this photo comparing the action of the SIG550, AK and SIG552 …
More info about the upcoming 7.62×39 SIG550.
[ Many thanks to Noody, TroubleShooter and Gun Blobber for the info. ]