bumperboy rotating gunner

[DL]

Can someone buy these for bumperboys they already have? or do you have to buy them when the launchers are purchased. I'm not necessarily going to buy any, and was just curious. They aren't listed for sale in the two catalogs I have, or the website I checked.

[lablover]

You can buy the parts from BB, and attach to any BB.
They do blow down in the wind, if the BB is not staked to the ground.