This what CSMC had to say about the RBL single triggers, as posted in a FAQ section on the RBL website:
18. Single Trigger. It is a single trigger with selection in the trigger, very similar to a Model 21. We feel it is the most reliable trigger we know of. Because the top and bottom tang are joined in the rear, and the use of a drawbolt for the stock, there is no movement between the top and bottom tang because they are joined almost as one piece and movement of the top and bottom tang creates most of the problems with single triggers. When top and bottom tang screws are eliminated on the RBL, because the use of the draw bolt, this eliminates most of the problems.
