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I have purchased many airsoft guns and accessories from Hong Kong and locally here in California. I have been very fortunate to have met an dealt with some great people and purchased some great airsoft products and services. In most cases Japan will not ship airsoft directly to the U.S. and precautions have to be made for Hong Kong retailers to sell to the U.S. because of U.S. Gun Control Laws and Manufacturer Copyrights.
RedWolf Airsoft
Location: Hong Kong
I have purchased 1 AEG from Redwolf Airsoft and some accessories:
Marui M4 R.I.S. 
I ordered this gun from RedWolf during one of the Special Promotions. It was VERY inexpensive and included shipping costs and discount on extra magazines, This was about 3 months after Marui released the M4 R.I.S. so I was eager to place this order. Added a Ready Mag System, M120 Spring and upgraded Gears, 9.6 1700Mah Ready Mag batteries, Systema M4 Metal Body, Bushmaster R.I.S. Shields, SAS 3 point Sling and Norinco Red Dot Scope with handle mount.
Currently this is how the rig looks 
RedWolf's sales guy(s) are very helpful and they will carry some trick items from time to time. But there website is in some need of a shopping cart program. The have some nice reviews of airsoft products and a nice section for the "do it yourselfer". Also their prices are eon the high side compared to other Hong Kong retailers, but they will match prices. And as in the special deal I got on this M4, they sometimes have insane sales.
I ordered a [URL="http://www.digitalwastelands.com/content/index.php?option=com_content&task=view&id=65&Itemid=29"]Tokyo Maru M4 R.I.S.[/URL] from RedWolf during one of the Special Promotions. It was VERY inexpensive and included shipping costs and discount on extra magazines, This was about 3 months after Marui released the M4 R.I.S. so I was eager to get this item.
The down side on this is my M4's gear box crapped out and plastic body broke a week after I received it. No fault on RedWolfs part, but emails went unanswered pertaining to this. (They used to have a 7 day return policy) but at that time they just partnered up with The QProject local to California and they tried to help me get this fixed for a discount. I chose to go with Airsoft Extreme though which are also local to me in that I trust them from past work, upgrades and repairs.
Their website is functional but a bit sluggish to load at times. It has a customer loyalty type of point system that lets you spend earned points on products at a later date. The 1 part the implemented is fixed weight costs on all items adn they padded the weights a bit it seems. Shipping charges tend to be higher using this method.