Airsoft Atlanta have some new Barrel Socks in stock:
New Barrel Sock rifle covers in stock at Airsoft Atlanta. These are heavy duty nylon socks, with a Cordura reinforced ‘business end’, for use at airsoft fields. When you’re walking off the field, safely empty your gun magazine/barrel, put it on safety, and cover your barrel-end with one of our safety socks. These will attach to 95% of all the guns and rifles made. A long nylon cord will securely attach to your gun, to ensure safety off the field. A must have for ALL airsoft players, especially at all the new airsoft fields opening up. Airsoft Barrel Sock – in stock and shipping today!
http://www.airsoftatlanta.com/Airsoft_Barrel_Sock_Cover_Protection_p/39999.htm