The rear trigger sets the front trigger to a lighter pull weight. If I don't set the trigger I have a lot of creep to take up the first stage and about a 4 lb trigger pull. Once I set the rear trigger my front trigger has no creep and about a 4-6 oz trigger pull. It just allows me a few options while hunting that normal (non set) triggers don't. Plus that was the only action WA had when I purchased it off of the forums.