I just ordered this today to replace my upper off another gun, I have to say... I have some really positive experience with Radical firearms and I’m down right excited for my upper. I’ve put roughly 10,000 rounds through one of their 5.56 uppers over the course of 4 1/2 years and I have to say that I have not had 1 malfunction. So I’m excited. Lol maybe a little giddy even