A quick review of the various STW models from A&K by Raven Airsoft. Said to be based on the Systema Engineering PTW models, these have full metal receivers, quick swap cylinder design, steel housing mid cap magazine, and exchangeable cylinder set. The models shown here are the M4A1, M4 Compact, and M4 Spider.

Turn on your language captions again as REAPERs Airsoft reviews a cheaper clone of the Sytema PTW, the A&K K4 PTW/STW. Just like the PTW it uses the cylinders to change the FPS of the AEG. It has a 120 round magazine which the rifle stops firing when it is emptied. It has its MOSFET and full metal receiver.