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Originally Posted by The Reaper
Archangel, you are incorrect.
The 20" barrel adds about 50 meters to the effective terminal ballistics range (2700 fps threshold) of either the M193 or M855 ammo. While that does not sound like much, it is actually about 25-35% difference, as it extends it 95 meters to 150 meters with the M855, and from 150 to 200 meters with the M193.
The barrel length is irrelevant to accuracy. The sight radius MIGHT be, if you are shooting irons. If you have a flattop, you should be shooting optics.
The only other effect of the 20" is that the increased velocity of the longer barrel will help it shoot flatter at longer ranges.
What is the basis for comparison to recommend the BM over anything else?
TR
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Thank you for the correction sir. I've learned something new tonight.
As far as the BM, it is just my preference. I've built a dozen or so AR's for myself & my buddies. Unlike some of the other uppers that I've used, I've never had any double-feeding/extraction issues with any BM uppers (or Colt's).