FN have a new 7.62x51mm (.308) autoloader called the FNAR. It is only available in 7.62x51mm and comes in two models Light barrel and Heavy barrel.
It uses AR-10 magazines. (UPDATE: Owners report AR-10 magazines CANNOT be used).
The FNAR puts autoloading speed and bolt-action accuracy in your hands. Every FNAR rifle must meet a 1 MOA or better accuracy specification, just like the FN SPR precision rifles. The receiver is constructed of aircraft grade alloy for light weight and strength. The fluted barrel is offered in a choice of light or heavy contours and features a hard chrome lining and recessed target crown for accuracy and long life.
The action looks like it is based on the Browning BAR (not to be confused with the Browning Automatic RIfle, which is completely different), a sporting auto-loader. Browning is owned by FN.
These excellent photos were take by TalonArms.com