[The Crow]

I just installed a bolt m in my rifle, using a fieldcraft trigger box for the 90* sear. Works wonderfully

Edit: I don't have a fieldcraft, just the trigger box in my jg bar10

Edit 2 (now that I remember): The Bolt M does require some non-destructive modification of the fieldcraft trigger box. But could easily be reassembled for spring should you wish to return to that.