Wasn't aware there is a third gen but would not be surprised. The gun was introduced sometime in March/April, I believe (Gen 1) but Evgeny (the owner) is intent on making the best product possible so made some modifications to the moderator and some other minor improvements in June. However, I don't know how you would tell except by serial number, enkey. As far as I have been able to determine there are no appearance cues that would tell you. Perhaps you could contact Evgeny and ask for serial number demarcations for improvements.