That's because they were. I know some collectors get hung up on FIFO, but it doesn't explain every anomaly seen by today's collectors. Some guys use FIFO to justify their carbines, in this case, to be original even though it's no more than a leap of faith to think that way. If you really want to know if that barrel is original to that Inland, take the stock off and pull the slide back, then look for a slightly bare area just in front of the gas cylinder. Inland finished their carbines as a unit, so in the case of barrels, they would pull the barrel band all the way back to the gas cylinder and apply finish, this would leave a bare area (maybe a shadow is a better word) just forward of the cylinder. How wide is you bare spot or shadow if you will-that will be the answer to an original barrel on this Inland.