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You can find a ton of info about guns all over Youtube, not to mention ebooks on torrents and p2p networks (try soulseek, fopnu, darkmx etc). I used a media downloader on Linux to grab up field stripping tutorials on all the guns I personally own from Youtube so I have offline backups of how-to videos. Also, check out some local rural Antique shops sometime, I have seen A TON of gunsmith books being sold pretty cheap throughout the years. There is a ton of hidden knowledge in old books being sold as antiques. Some of the best book stores are thrift and antique markets. ;)