That groove really isn't for the hand guard cap, it's just an under cut to remove any tool radius at the corner of the gas block journal and the shoulder. With a hand guard cap the rear of the gas block or front sight typically sits about .026"-.030" from the shoulder with the hand guard cap filling that space. Without a hand guard cap expect to see about .030" gap between the shoulder and the gas block. I'd be concerned with the rail/barrel nut interface, if the gas block is inline enough for the gas tube to line up with the carrier key without noticeable interference with the carrier key or barrel nut, I'd say its where it needs to be. If you can slide on the gas block without the aid of a hammer I'd expect to see some gas leakage at first.
What direction does the gas block appear to be canted?


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