I have some Lantac E-BCGs and Dragon brakes. I've got 2 E-BCGs remaining and 1 5.56 brake. If you don't know about the E-BCG please read up below. It's one of the best BCGs on the market. The same is said about the brake. Pricing for the EBCG is $275.00 and the Dragon is $125.00 + $10 for shipping and handling.
E-BCG
http://www.lantac-usa.com/AR15-M16-M4-Rifle-Accessories/556NIB.html
Dragon
http://www.lantac-usa.com/AR15-M16-M4-Rifle-Accessories/DGN556B.html
E-BCG
http://www.lantac-usa.com/AR15-M16-M4-Rifle-Accessories/556NIB.html
Dragon
http://www.lantac-usa.com/AR15-M16-M4-Rifle-Accessories/DGN556B.html