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Geissele mk8 or mk16

FWIW I have a mk16 on a 14.5 upper I just built and really like it.
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The MK8 is tight on the ID. May limit your gas block selection to the included Geissele GB. It seems more ridgid than the MK16, but may be just my imagination as I have not attempted to test this theory. I like the naked feel (grip) of the MK8 better than the smoother MK16 but that is personal preference. Both are outstanding rails.