I have a FN M4 Military collector's edition upper for sale, it is just an upper and charging handle, the BCG and Knight's Armament Quad Rail will not come with it, hurry and place your order now as this is a rare upper, I have only fired it twice, and have thoroughly cleaned the upper, upper has the square forge marking for correctness, as well as proper F marked height front sight post to ensure a proper zero with rear iron sights or carry handle, all REASONABLE offers will be considered, no low balling please, thank you!