I have a LMT factory upper with a LMT MP 5.56 NATO 1/7 CB barrel. It has a Arms SIR 50M rail system. I've shot about 500 rounds through it, the paint is just Wal-Mart paint, easy to remove. No bolt and charging handle, comes with Knight Armament grip. $615 shipped I take Paypal + 3% or moneyorders. Thanks!