Factory FNH Five Seven pistol barrel, only 20 rounds were shot from this barrel, to feel and see difference between original barrel, and the Jarvis threaded barrel. I upgraded my FNH 5.7 factory barrel with the Jarvis 5.7 threaded barrel. This would be a great addition as a backup barrel for those shooters that have put a lot of rounds through their existing factory barrel...or simple a great replacement barrel... either way, this is a win, win considering the price for a new threaded barrel...or even another new factory 5.7 replacement barrel.