"The patent-pending Magpul® ACS™ (Adaptable Carbine/Storage – Military Model) is a drop-in replacement butt-stock for carbines using mil-spec receiver extension tubes. A streamlined, anti-snag profile shields the release latch to
Like new, but used. Put on the rifle and removed. I bought these thinking I had a trade for a Carbine length upper, however, that fell through, and got a midlength instead. Brand new these things sell for around $200.00 
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