Saw this on Amazon. Haven't read through it yet so I can't tell you if it's any good or not. But free is always good.
http://www.amazon.com/Detailed-Instructions-For-Gunsmith-Home-ebook/dp/B00IRIX1TO/ref=zg_bs_156699011_f_4
http://www.amazon.com/Detailed-Instructions-For-Gunsmith-Home-ebook/dp/B00IRIX1TO/ref=zg_bs_156699011_f_4