I have seen this one pop on GB a few times. I have looked through rule's book and found nothing on what this variation of gun this could be any one know?

http://www.gunbroker.com/Auction/ViewItem.aspx?Item=555282839

Last edited by aguyinAK; 05/06/16.

Three most useless things to a pilot are:
1. The altitude above you
2. The runway behind you
3. The fuel on the ground