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I wonder if the flash is as present with other ammunition?
It also seems like a lot of that blast is farther back than i would expect. Is that a 5.56mm suppressor? Something with high back pressure on 5.56?
I would take off the handguard and inspect the barrel, make sure its tight into the trunnion and "whole".
I have shot my BRN180 with the suppressed cup with a Hybrid extensively and with irons. I have never seen a flash like that under the handguard.
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I pretty much shoot this ammo exclusively but I'm sure I can source something else to try out.
The suppressor is a Sandman S with the stock .30cal cap, so back pressure shouldn't be too crazy high.
Giving the rifle a quick once-over this morning, I didn't see anything that looked out of place. There's definitely some carbon buildup around the gas block/cup area but it looks pretty much the same as when we were shooting unsuppressed.