The Omega was my first MZ and continues to be a favorite. One thing that has always bothered me is the poor balance as a result of the hollow stock. I was sitting around last spring thinking of ways to remedy the situation and thought I'd put caulk in to fill the stock.
Over the summer I've added 1/2 to 3/4" each week allowing for drying time between each application. It took about a tube and a half and probably added 1 lb. to the rifles over all weight. I'm very pleased with the feel and balance. I think I can take the caulk out if I ever wanted to do so but so far so good.