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Preston, this upper has a .750" gas block journal.

Not to disagree, but from everything I can find, this upper has a 'heavy contour' barrel .. and some heavy contour .450 barrels use a .875 diameter gas block, while some use a .750. I would suggest, just to be safe, that you call Windham Arms, Preston, and verify the size of the gas block before you commit to anything. Their customer service # is 855-808-1888.