Airsoft Master gives us an overview of the G&G Armament Combat Machine CM16 SRS... "The latest addition to the ever popular G&G Combat Machine AEG line is the all new CM16 SR series. This is a brand new model of affordable line of intermediate level AEG that G&G came up with this year, with a few new internal and external improvements, this is definitely an upgrade to the original battle tested G&G Combat Machine. The CM16 SR series comes in different lengths to accommodate different airsoft game scenarios."