I'd recommend a good trawl through mwrforum.net. Here's a flavour:
http://www.mwrforum.net/forums/showt...h-G10-markings
http://www.mwrforum.net/forums/showt...s-a-hypothesis
http://www.mwrforum.net/forums/showt...ch-Information
http://www.mwrforum.net/forums/showt...e-Missing-Link