Sorry I can't add anything just yet. I have not had much time with the KRB as I had huge orders to get out before the Christmas trip to Oregon to see the youngest and his family. Had 90 gallons of firearm grease to mix and deliver and also 1500 bottles of bicycle lubricant to fill and ship before leaving. I plan on shooting both the KRB and the new U-mag when I get caught up in middle of January. Since I did not get drawn for anything this year I did not push the shooting schedule. My little "part time" business is cutting into my play time.