ATR is cheaper than the 4x4.
They're the same action, ATR has a blind mag, 4x4 has a detachable.
ATR only available in synthetic stock(fake wood synthetic available), blued steel.
4x4 in synthetic, walnut or laminate, with a stainless looking coating available.
Thats about it, 4x4 is just a slightly fancier version of the ATR.
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