If you want to get airsoft gun from Japan, you need to check your customs house if they will accept airsfot gun from overseas. Japan has its own regulation on airsoft guns. But it differ from country to country. For example, US customs dose not accept any airsoft gun which do not have orange tip and orange marking on muzzle.
There are some regulations on airsoft import in UK, France, Italy, Germany and Spain.
If the item is sent as gift with low value, not to mention airsoft, you may get it without any trouble at Customs in your country. But it means that you have just luck.
My friend did not know details of the airsoft regulation in overseas cuntries in the past and had sent out several items without problems. But now he always asks buyers if any problems in destnation customs house and regulations or so on.
I know one web site who are selling airsofts all over the world and saying no problems even to USA. But I am not sure how they can send or they are just lucky…..
When you buy items on internet, web shop, you better to ask toy shop owner how they are going to ship. Airmail, EMS, UPS, Fedex ?