Just saw this on The Firearms Blog:
http://www.thefirearmblog.com/blog/2013/03/06/saiga-mk-107-the-civilian-ak-107-with-balanced-recoil-arrives/
Izhmash will debut the long anticipated Saiga MK-107 at the IWA show in Germany tomorrow. This gun is the first ever civilian-legal variant of the AK-107 / AK-108 with its famous balanced recoil system.
The balanced recoil system moves a counter weight forward when it pushes the piston/bolt carrier back. This counteracts the force of the bolt carrier slamming against the rear of the receiver and against the chamber. The animation below demonstra