I am new to Glock, but have been shooting semis for some years. I don't mind taking an engine apart, but have reservations about complete teardown of Glock without guidance. I did a download of a 42 page doc that says "Armorer's Manual Glock Safe Action Pistols" on the cover. Naturally I don't remember where it came from. Is this likely to be an old version of the real thing? I have been able to find everything it contains in one place or another, but like the idea of using actual Glock info.