TBox barrels are what we consider to be the best AR15 and AR10 barrels on the market. With 100s of groups well under .5 MOA and years of testing, we have found this to be the most consistent AR15 and AR10 barrel we have ever used. These barrels are what we use in all of our high end AR15 and AR10 competition rifles that have been extremely successful over the last few years. If you are looking for very accurate AR15 or AR10 barrel you are in the right place.