Bead thread on Dominion Arms Grizzly?

Metric?

If it's a metric thread it won't fit any of the standard threads then? I was guessing it would be the common 6-48. Has anybody changed the bead in their Dominion Arms 870 yet? Is the metric thread smaller than a 6-48 and can it be tapped for replacement with a 6-48 thread?
 
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