I did run a patch after 20 rounds. I also used a little oil as I didn't want it to run dry. As I mentioned earlier, my hand loads shot great without any problem. I had bought a couple boxes of fusion to hunt deer with and never used them. I took them to the range to see how they shot. The fusions are shorter in oal than my hand loads. On my fusion rounds I did not load a full mag. I loaded 10 each time. The gas block doesn't show any signs of slivers but the bolt had some around the extractor. Most were located at the beginning of the bore. The cleaners I am using are pictured below.