i think in the MX15 line there is only one rib.. In the MX10 line there are at least 4 different models.. (ask me how I knw)..I needed one and found out the hard way.. I don't know if a MX2005 rib will fit a MX15 post setup.. Try it with a friend who has a MX2005 and see.. Please post back what you find out.. All Good.. Mike
the heads up style works well for me. so far I have 3, 50 straights(2 from the 16 and 1 from the 27) with this stock and it isnt even finished yet. the drop at heel on this stock is right at 4". this keeps my head up increaing my field of view as well as keeping me from lifting my head off the stock. once I have the gun mounted in my shoulder I honestly cant get away from it. there is no way I can lift my head off the stock.