Raven Concealment is currently marketing a rather nifty cover for detached AR-style weapon upper receivers. The “TopStop AR Cover” is designed to be mounted to a dis-mounted AR upper (with or without BCG) and keep everything contained during transportation or storage.
The TopStop snaps into place and seals the upper receiver from dirt, debris, and other fouling. It is manufactured from robust polymers and Raven claims that it is “impervious to most solvents and chemicals.”
The TopStop cover is available in Black, Ranger Green, and Hi-Vis Yellow for $9.99 on Raven Concealment’s website.
My take? I need one for each of my Sporting Rifle uppers. Now to go find $110… (I know, I know. I need a few more uppers!)