Can anyone recommend a good ar15 book to me. Just bought a Franklin Armory lower reciever(complete with but stock) but not sure what to put on top. I know I would like a 20 inch barrel. Wanting to shoot out as far as I can. But I don't know the ins and outs with these guns like what is the best rifling for this barrel, best bullet weights. Will the front sight get in the way of a scope. Looking for a book that will explain all this to me. This gun will be used strickly for targets, no hunting.