Sportline version nof the ASG M4 SIR S-System AEG is now available at Airsoft Atlanta with a video review included in this news post... "The new ASG M4 S-System with fully licensed SIR ARMS, now in stock at $134.99 Youtube review video is also up. Unlike other railed guns, this will accommodate a 9.6v nun-chuck battery very easily.  A solid and consistent 370 FPS right out of the box.  Flip up rear sight also included.