It seems to me that 6.5 Grendel excels at delivering greater punch at long distances from a regular AR15 sized rifle. Though it can be suppressed like any other rifle, it doesn't seem to me that you'd be able to get the velocity down enough to avoid the supersonic crack downrange. I think .300 Blackout (or 7.62x39 with special loads) is your cartridge if you're wanting to do that.
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