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Transgender-theme AK-47, because 2nd Amendment!
(slrpnk.net)
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RULES:
AR-15s are popular because there's a single standard, and all the parts made should fit that standard, and more-or-less work. I can buy a barrel from any one of ten or more manufacturers, and I know that it's going to fit on my receiver (although I might need a different gas tube). You can't do that with a Ruger Mini-14, you definitely can't do it with any of the fuck-knows-how-many AK variants. ARs do have their own shortcomings it's true, but all rifles have shortcomings; the AR-15 platform does a pretty good job of balancing the competing needs and desires.
True, but primarily, because NATO wants them in a certain spec.
Again, once the US military switche from it, then so will everyone's opinion.
I don't think that opinions will necessarily change even if NATO decides to use a new rifle. Even if the US and NATO eventually adopt the Sig XM7 in 6.8x51mm, AR-15s will still be cheap, ammo plentiful, and they'll all still be on the same standard. (Plus, the 6.8x51mm cartridge is a real barrel burner; if you're a higher volume shooter, you'll get maybe 5000 rounds out of it before accuracy is shot--pardon the pun--to hell.) But, we'll see. So far the design has stuck around and been refined for over 50 years. Hell, people still use the 1911, and that's over 100 years old.