According to the website anyways.......$170
http://palmettostatearmory.com/index.php/catalog/product/view/id/13338/s/5-56mm-full-auto-profile-bolt-carrier-group/category/332/
http://palmettostatearmory.com/index.php/catalog/product/view/id/13338/s/5-56mm-full-auto-profile-bolt-carrier-group/category/332/