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You should be fine except you have to remove the muzzle device and gas system from the colt barrel to get the special DD barrel nut on. It has a proprietary tool too, it looks like.
The gas system will be a bit of a challenge to remove possibly due to carbon build up and not sure how the gas block is positively mounted by colt, but surely it is....rockset or ??
Might need a new bevel washer for your MD also.
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