If you think high end AEG, you'd immediately think Systema. The quality of their AEGs is in its own league with no one else to match. The only problem is that their outlook is rather ordinary. If you want some custom work for it, you'll need to look to a high quality manufacturer and RWA does exactly that! RWA also make high end quality products and parts and this time they've released a Spikes Tactical CNC Lower Receiver for Systema PTW M4 Series. A high end custom part for a high end AEG.