Remember, if we don't already have it! We can get it! Just order this fresh in from PTR for a customer! The PTR GI features a 18" match grade threaded barrel with removable flash hider and now 5/8x24 thread pattern for wider variety of muzzle accessory options. These barrels are built with the proper Fluting and will work with the wide variety of .308 ammo on the market today. If you are looking for the Old School Look of the Roller Lock Battle rifle check out the Classic !