My son was one of the three testing and the frames look good with good triggers. We tried 8 barrels the first night from a 22 to 45-70 one was an older octagon hot shot barrel. With about 75 rounds fired to check function. Out of 15 barrels tried so far my 357 Max barrel would not fit and one other barrel. The problem was the barrels and NOT THE FRAME. They both had a burr on the rear of the barrel boss which prevented closing. A couple of swipes with a stone or file to remove the burr and they worked fine. It is a simple fix. Marty at Hause of Arms has pictures of the fix both before and after if you have any trouble with barrels. We should have three more pre ordered and paid for frames to check soon and have more barrels to test fit . Looking good so far!