Best gun forum on the 'net.
HK94.com
(Click on "Gun Forum" in the Navigation bar)

A few firearm reference sites. These are great for looking up info/pictures of a gun you're trying to model your A-5 after.
http://world.guns.ru
http://www.securityarms.com
http://remtek.com/arms/
http://www.hkpro.com/

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