I am leaving work. post up a link to a MMR K. The hellion kit was originally designed to work with the UPR and the Granatelli. the granatelli is like the MM unit, but without the smaller bar that is welded to the main bar and 45's back to the side supports. so if the MMR is like that, it could possibly work. send a link and I will take a look later.
it looks very close to a MM or granatelli piece. I only see the one pic, but looks very close and you can see the smaller bar that 45's back. that bar would probably have to be cut off.