I don't blame u for being dissapointed with your TK 2000. I purchased one of the from Cabelo's and mine was in good shape. I did notice the plastic trigger gaurd. Mine is an excellent shooter but if it came in the shape yours did I would have ask for a replacement or do as u did and order a different ML SG. I would be interested in how your new one patterns. I didn't buy that one because of the patterns my friend was getting with his.
Good luck.