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.

Features:

• Velocity: ~370 fps (enhanced version)
• Gearbox: Version 2 (Metal)
• Magazine: 350 Rounds
• Battery Recommended: 9.6v Mini or 9.6v Nunchuk
• BBs Recommended: 0.20g +
• Barrel Length: TBD
• 9 month warranty from ASG"