Hi BillRuger,
I see your a firefighter, /ubbthreads/images/graemlins/grinning-smiley-003.gif, I was, retired after thirty years of fun. I made mine using 3/8" fiberglass fence post for electric fence from farm supply store. I cut them down to 38", put about 8" of 3/8" rubber hose over the ends the rifle will rest on, then roll four or five of the castration rubbers that are used on sheep about an inch or so from bottom of hose ends for the pivot. They work great and cost about five dollars to make.