Went through the rifle this morning checking for anything loose with the optics, but found everything was tight.
Having owned quite a few BCM uppers over the years, I've found all functioned perfectly but varied quite drastically in accuracy (precision). One government profile I had was atrocious and ended up sending it back to BCM, which they credited toward an upper with the 16-inch SS 410 barrel. That was the most accurate upper I ever owned, but I made the mistake of making the rifle way too heavy with my optic/stock/quad rail selections.
This BFH ELW upper is really amazing for it's weight, and all things considered ranks as one of the most accurate, perhaps second only to the SS 410. If I ignore the one-in-five flyers, it's actually very close to the SS 410. Though I'm still open to any other suggestions on what to look for, I beginning to believe that this is simply the characteristics of this barrel. Pinching the barrel to the end of the handguard, a very considerable amount of flex can be seen and barrel harmonics could certainly explain the performance I'm seeing. To put it in perspective, according to the BCM website the 16-inch BFH ELW barrel weighs 22 ounces, the 16-inch SS 410 weighs 33 ounces - the latter is obviously going to be much more rigid.
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