Does anyone know if there are any BCM bolt carrier groups available. I am waiting for them to come in stock and I check daily but they seem to have been out of stock for the longest time now. I have found LMT,Daniel Defense and Rainier Arms BCG's in stock and available and am wondering if any of these would be a good alternative to the BCM one or should I keep waiting. By the way this is going in my 14.5" BCM middy upper build I am doing.