It will depend on what type of trigger assembly Savage used at the time of manufacture for the Savage model 11 Trophy Hunter your brother purchased. If it is the Axis-style trigger assembly and hanger, and you are a paid member, you can go to the Home page on this sight and look under the Articles tab. There is a step by step article with pictures on how to convert an Accutrigger for use in an Axis trigger assembly. Otherwise I don't think you can install an Accutrigger on a non-Accutrigger Savage action. You will need to use a Savage Timney, Sav-1 or -2, or SSS competition aftermarket trigger. A picture of the actual trigger assembly would allow us to give you a definitive yes or no answer. Savage is always changing things up, which keeps us guessing.