At some point, I want to get a 557.  I like the idea it does not need an additional mount to get 1/3 cowitness, unlike my 552.  The built in BDC is also a nice bonus.  Will the GG&G Accucam currently offered work with this model?  I usually do not like to "bolt" optics onto my ARs, since that defeats the purpose of having quick deployable BUIS, plus I like to clean my ARs without the optics attached to them.  I must admit I am a Larue junky, but am willing to try something different as long as it works well.