yeah it's super easy, the hard part is finding a rail with compatible threads. There's no standard so it's trial and error. When Specna used E&C as OEM you could pretty much use any E&C rail however I've not done any testing on their new line so can't advise. Some of the rails that I see come with 2 different threads on either end of the barrel nut, gives the best chance of fitting, however not seen this types of barrel nut on many other rails.