AHHH the price! Having slots facing sideways and upward is't really conducive to saving your night vision but I guess it will reduce muzzle flip. Not really a flash hider then is it?
If I remember rightly the Steyr AUG had a flash hider designed to vent gas away to the sides avoiding lighting up the sights. They seemed to work OK but then 21 inch barrels produce a bit less than 14.5 inch barrels.
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