My reference books are still packed. Can someone explain the difference between the 600 trigger that was recalled and the 700? I know I've seen both but my swiss cheese memory is working again.

I haven't seen a 600 trigger for several years, but I seem to remember the trigger finger piece is farther forward and the safety tab is different, but the internal mechanism is the same.

Bruce

The trigger assembly is further forward on the 600 because of the shorter tang. A 700 trigger on a 600 won't work as it interferes with the rear guard screw.
Butch

quote:

The trigger assembly is further forward on the 600 because of the shorter tang. A 700 trigger on a 600 won't work as it interferes with the rear guard screw

Other than the location of the trigger were the mechanics different?

The 600 triggers are mechanically the same as the M700, but most of them were made with folded sheet metal sides (instead of riveted, flat plates) and many of them had double sears...one is actually the safety cam the other the sear. Of course that means it automatically has half the sear engagement of a full width sear AND the pressure on the connector is asymmetrical.
Audits of new guns has shown a great quantity of them that will 'trick', which means the safety cam is not raising the sear high enough. They made several changes to the dimensions to get away from that, but unfortunately one of their 'fixes' was to deform the safety cam by knurling or flattening to give it more lift. They wear VERY quickly and can be failing again with relatively little use.
I suggest examining all M600 safety levers for that deformation 'repair' and replace the lever if it has it. Better yet, replace the entire mechanism with a solid trigger and single sear aftermarket trigger.