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Originally Posted by Shadow9mm
Personally, never shot one. But the idea of a bullet that is on the razors edge of being stable so that, with FMJ ammo, it should destabilize and tumble after striking a target, seems like a VERY limited use case with a LOT of drawbacks.
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One of the first ARs I made had a 20" Green Mountain 1:12 pencil barrel. It's just over six pounds with sling and optic and does great things with 50gr polymer tipped rounds. It's neat and so long as the cheapest rounds are 55gr, I won't worry too much about being able to find rounds that work.
On the other hand, it won't keep 62gr green tipped rounds inside a one foot circle at 50 yards. For some people that would be a considerable drawback. If I had to find and shoot only 40gr rounds for a barrel, I'd find that unduly limiting.