I wanted to be 1st.
Take some sandpaper I use 800 or a 1000 and polish entire out side of barrel it will shine up nice. and looks good thru ejection port. Also polish lug inside where pin rides. Do all by hand takes maybe 20 min. you barrel will shine and your lug will be smoother less friction. You can hit feed ramp it will polish go in direction bullet not side to side. (my new gen 2 were factory polished on feed ramp) No dremel tools.
A little chunk of fine sand paper and you all needed.
Note I have 3 gen 2 now and none have required a F&B like older ones. I do barrel for looks and fun.