I have one .40 cal. flintlock squirrel rifle that has a single trigger. It works great and was the correct trigger for that rifle. I also have a .36 cal. caplock squirrel rifle and it has a set trigger. When I hunt with it, I always use the set trigger. Having that hair trigger seems to really help with the accuracy of the rifle. But, that may just be me. If you are not concerned with having your rifle correct in style and just want to build a good squirrel rifle, , I'd say that a double trigger would be my choice. If you want to use the set trigger, it is there for you, If you choose not to use it, you can just use your front trigger unset. It will be a bit heavier than a single trigger but it is not all that much heavier in most cases. Bottom line, spend the few extra bucks and you will have the choice of using your trigger in either the set or unset position. I really think that once you get used to using a set trigger, you will love it.