Quoted: Details? Did they have to eliminate the bottom lug for feeding, thereby putting unbalanced stress on the rest? I'd have though that thought this problem could be eliminated by making two large lugs (AK style) as opposed to many small perfectly machined ones. The 7.62*39 AR sheared lugs because it tried to use the same bolt , but with a larger face which took precious steel away from the lugs.
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The FAL mag is narrow and designed to feed to the center. This works just fine in the tilt-rear locking bolt setup on the FAL.
In order for ammo to feed correctly in the AR, it was necessary to remove the bottom (6-o'clock) locking lug, which did indeed cause unbalanced stress on the bolt and resulted in bolt lugs cracking and sheering off. There is no way to avoid this with the AR's bolt design.
Hesse and ASA tried to make FAL-mag ARs a couple of years before BM, and they left the lug in place. To the surprise of no one who understands how ARs work, they could never get the ammo to feed around the bottom lug reliably from the narrow, center-feeding FAL mags.
FAL mags and the AR design are INCOMPATIBLE. Some people STILL need to come to grips with this reality.
-Troy