I have a full length textbook covering all aspects of military and police sniping. Some of it should be adaptable to airsoft. I havn't read it all yet, but so far it looks very good. If you want a copy, hit me up on AIM (lasersailorry) and I'll file share it to you. It's too large to host (44MB). Once you have it post up here so others can ask you for it.