Sorry, I should have been more clear. I just googled it after seeing it, and found them at several places where they are available apparently. If I remember correctly, the polymer one's are about 7oz and $150.00, the aluminum one's (although I did find one in supposed titanium for $250.00 somewhere) are about 11oz and were running either $200.00 or $225.00. They seem to be pretty sweet and there are also threads at AR15.com