Just to add more confirmation to the over-sized gas port issue, here is a video from 2014 where a DD rep states that the gas port is "optimized...to function reliably with a wide variety of ammunition" (at about 1:07): https://www.youtube.com/watch?v=s3toPQwWw0s. I take this to read "oversized" for crap ammo.
Of course, I guess one has to rely on their legendary customer service to get your bolt and/or other parts replaced a head of schedule due to the rough operation of the system.
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