The Viper XM-177 is the best air soft gun I have ever held. The workmanship is better than the Inokatsu guns in my opinion. As soon as I get my hands on the M16A1 version I will have my 2 primary combat weapons. In combination with the ProWin 20rd magazine they are a very realistic and satisfying combination for Vietnam operations.
I got involved with Viper because of a shared interest for the Vietnam conflict. One of the owners, they are brothers, offered to send me a XM-177 to test. Some of you may know I make PRC-77 radio modes for Vietnam simulations and I sent them one of my creations.