I finally got around to setting up the new 350mm .25 barrel that I bought over a year ago. Before installing the new barrel I went ahead and polished the inside of it. Here are my early morning before work results. I was running short on time so I was only able to sight in and shoot another 4 shot group. The range is 25m, jsb25 grain going 770. Considering these are the first groups after polishing and cleaning I am quite happy with the results.