I had a chance to spend some time with the Glock folks to confirm availability of factory Glock extended and threaded barrels. Glock confirmed they are working on production of pistols that will ship with threaded and extended barrels. You’ll start seeing those midsummer, and pricing is  still to be announced. Glock also confirmed that barrels for existing Glock owners will be available late this year with pricing to be announced. I checked out one of the Glock 17 barrels and they are top notch, with a 13.5L metric thread pattern