All of the items (Handguns, Rifles, SMG, Accessories, Parts,etc.) that Hoei Shoji handles for the Japanese market, are all conformed with Japanese Airsoft gun Regulation act of 2009. All imported items from Taiwan, Hong Kong and all other foreign countries are checked to make sure they meet Japanese regulation standards.

Full metal handguns are prohibited under the Japanese Airgun Regulation. It is illegal to import these handguns into Japan.
Japan Police Metro Head-quater Home page; http://www.keishicho.metro.tokyo.jp/seian/kenjyuha/modelgun.htm

Japanese made handguns with oversea made metal upgrade parts are also considered to be illegal.
ASGK Home page http://www.asgk.jp/
STGA Home page http://www.stga.ecnet.jp/index02.html
JASG http://www.airsportsgun.com/index.cgi?d=index&e=indexsub