I am in the process of building a 8.5 inch 300 Blackout. Just my second build, so fairly new to building these. Anyhow, considering purchasing a Toolcraft BCG, M16, phosphate. $79.00 plus 3.95 shipping. I really know little about this BCG from personnel experience. Internet info seems to be very positive. Has anyone used one of these? If so, opinions? They seem gtg to me.