Very easy to change barrels. Green Mountain is a great, accurate budget friendly choice, for more $ a Federson or a Kidd are great. If weight is a concern then the last two I mentioned offer lightweight options. Rimfire Sports and Customs is a great source for Green Mountain barrels, eBay often has good deals on Kidd barrels.Question, I want to put a threaded barrel on mine. How hard is it to do and opinion on what barrel?