ASG posted a video on their Facebook page showing the ASG Strike Systems ATS Cord-pull Mag... "This aggressively styled polymer magazine from Strike Systems features a high-traction textured surface and holds up to 300 BBs. Winding is easy using the innovative pull-cord, just flip the toggle handle out, pull the cord a few times and the magazine is tensioned to feed giving you enough ammunition to outgun your opponents in any firefight.

Will fit most M4/5.56 style Airsoft rifles."