Have 3 left to sell, like the title says includes the buffer ($165 value), rifle length spacer ($10.95 value), and a D-fender extracter assist ring ($12.95 value!).
These work wonders on taming recoil especially with heavier kickers like .308, 458 SOCOM and 50 Beowulf. For automatic users, it slows the cyclic rate approximately 20%. These weigh slightly more than a 9mm buffer and are suitable for use with blowback pistol caliber uppers like 9mm and 45acp.
Without the spacer the buffer fits collapsing stock tubes, with the spacer it fits rifle length tubes. For use in the AR-10 the spacer can be adapted by trimming it 0.750" . The buffer is not short enough to fit the AR-10 carbine length tube though.
A $188.90 value, my price is $150 shipped.