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I've fired a lot of blanks in my years in and out of the service. I've never seen barrel damage due to blanks, whether a BFA was used or not. I HAVE seen serious carbon buildup after firing blanks, and if you shot live rounds right after blanks, without cleaning the gun, you'd have a big problem. But I don't believe blanks alone would cause any problems. And 200 rounds of even live ammo wouldn't hurt anything. I've fired quite a few 250 round belts of 30-06 and 7.62 in one continuous burst and not damaged a barrel that I could tell.
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