i think most hard core ar-15 folks who really shoot a lot have aluminum ar-15 from top makers already and they are the most conservative and difficult to convert type, i doubt they are your best targeted buyers, only they may want heavy barrel. your best targeted buyers are new ar-15 users who are more open minded and who do not usually shoot a lot, light barrel will be perfect for them, lighter and cheaper, thicker barrel really only adds to the weight/cost and nothing else for them. your best advantages are price and weight, your price point is attractive, but S&W sport is cheap too, you need to add the weight advantage to win the battle, you need to bring everything out imho to counter your weak point which is your product is carbon and unproven. in my view the first product you bring out you need to get everything right get all the advantages out and make a splash to be successful.
anway just my 2c and hope to see your product soon