The Howa carbines were all made as part of an order from Thailand. The US did not have any extra carbines to send them as what was available was going to Vietnam. The carbines were made using some USGI machinery but all parts do interchange between them and a USGI carbine and about 10,000 were made. The bayonet system is different but it was made from an experimental system the US military had tried out but was not used as it was hard to update earlier carbines. The rear sight while a flip sight is also adjustable for windage. The only makings as to who made the carbines is the latter H on the bottom of the barrel receiver area. Only about 4000 finally came into the country till killed by Billy Clinton. These carbines were brought into the country to California from Canada and will be importer marked on the right rear of the receiver in small print. They are excellent quality and rival or better any carbine made anywhere else. Many were never used and were imported as new but used. Some needed parts and stocks before being sold and there were done using USGI parts.