You should be fine. Some AAC adapters are a tad more forgiving than others. I did a Mk18 build with DD10.3 barrel and RISII rail. One of my AAC adapters would not allow the can on, another did. If you run into a problem after its built, hit me with a pm and I'll take a pic of the one that worked. The can fits snug to the rail and yes it's sweet.
PB


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