Question I'm pondering is if the Sport barrel requires any kind of break in process? I recently picked up a DPMS upper for my Sport and am going through the break in process now. Instead of the "shoot one and clean" for the first 25, then after every 10 for the next 250-300 rounds, I am particular to the Tubbs finishing bullets. Have used them before on quite a few barrels with good results. Not sure how they would work on my Sport barrel with the melonite procedure.