You need to be age verified... once you are everything will become very clear.
Right now I don't think there's any CA M4 RIS in the retailer section, but things change all the time.
(The beauty of M4's is that all the parts are interchangeable so you can buy a base-line m4 then customize it into whatever you like and sell the parts you took off to people scratch building their guns)
Gun Technician and Tuner
Well versed in every AEG version and all major gas and spring systems.