Charlie..
here is a good mule web site..About 1/2 way down the page it shows two guys with a mule and a 106MM Recoiless rifle on it and the guy that is posing with the RC rifle would only take one shot like that...shit come out both ends of those baby's and the trigger man would be fried by the back blast..but it is a good site..
neat Little machine..
http://www.m274armymules.com/mule_history.htm