Venture Shop does a quick test and review of the ICS-20 M4 Full Metal AEG, also known as the ICS CS4A1 Retractable Stock model. This of course has the ICS AEG Split Gearbox, integrated spring release function to forward assist knob, detachable carrying handle, and adjustable stock with multi-length selections... "For today's review we brought that equipment that is 0 defects, the Airsoft Rifle AEG M4A1 ICS-20. In addition to a surprisingly realistic design, the model offers unparalleled performance! Release the video to see the ICS-20 in action!"