If you are planning to take that "battle" rifle and turn it into a bench gun, then there are a lot of adjustable and non adjustable triggers that you can choose from. Unless, you talk high dollars, just about any trigger that you get will involve going with lighter springs. One guy even mentioned cutting springs. You NEVER want to do that on a rifle that has to be dependable. ALL of the "match" trigger kits that I've seen from Bushmaster, LMT, Rock River, etc., use some sort of reduced power springs. They are after all, "match," triggers. The only trigger I know of that significantly smooths and reduces the trigger pull without sacrificing any sort of reliability is the Geiselle SSA trigger. The kit is a two stage, with about a total 4.5lb pull and uses full power springs.
Unless you are getting a trigger kit that requires adjustment for engagement and over travel (that you don't trust yourself to do), sending it to a gunsmith is a waste of money. Removing the trigger and performing maintenance on it is something that will NEED to be done at some point and you should know/learn how to do it. All that is required is the removal of two pins and the only tool that is needed is the tip of a bullet.