It wasn't just the chrome lined barrels that were bad. Not all barrels of Herlo's barrels were chrome lined. Many were made with the wrong rate of twist so the bullet would tumble before it even got to 25 yards. Some of the gas blocks were bad if I remember right. I think there were five or six major problems with them and that is why they were all rejected by the government. Some, a very few were ok in that they worked as they were supposed to but there was no way to tell which were good and which were bad. Even the Korean military rejected them when the one who bought them as scrap tried to sell the barrels to them. Look out for the ones that were stamped with a crossed cannon stamp on the barrel flat to make them appear to be accepted barrels. Sold quite often at gun shows as being real.