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I recommend the NEA AR adapter, and a magpul UBR. The UBR is expensive, but looks good. Or you could just go with standard carbine stock, almost as nice.
Well theres the NEA adapter that will give an ok cheekweld with AR height sights/optics (1.5") but it best suited to Troy Micro/HK 416 height of 1 1/8". The Dlask adapter is much lower allowing for optics mounted right down tight to the rail. I like the look of the Dlask adapter best myself. And of course theres a number of cheek risers available depending on what stock you go with.