Have had my eye on a Sturmgewehr mp44 (stg-44) for a while. this is a C.G.Haenel piece I am told. Other than what limited info I have found, are there any issues I need to be aware of concerning these Rifles? Would this be a good item to pick up, I generally do not collect German rifles, but this seems to be priced right (in my mind anyway). Any further info would be appreciated.