Be it chrome lined or not, the rounds shown for accuracy after X amount of rounds I would question. It would be great if that is a fact, but to begin with it is a rare M1A/M14 that repeatedly gives sub moa accuracy from the very beginning. It is the throat of the barrel that receives the most wear and after 4000rnds. there will definitely be quite a bit of erosion for that area of the bore is exposed to initial heat/pressure. Simple solution for bolt gun, remove barrel, recut chamber, and rule of thumb is you will restore barrel for some 1500 more rounds, can't do that on the M1A/M14, only replace barrel. The treatments mentioned may well prolong the wear factor and maintain acceptable accuracy. Flaking of chrome lining does occur from time to time, but have been told reason the chrome lined barrel is not as accurate as non lined is that the lining is not the same thickness from breech to muzzle, is that true,can't say?? From my experience after some 6000rnds. the barrel is toast, accuracy much degraded and needs replaced. The very platform as the M14 is not an inherent accurate rifle and if you make a list of all the things that owners go through to improve the accuracy it is a long list. Upon firing the rifle there is a huge amount of activity with bolt, op rod, gas system, etc., etc. and requires modifications to give better accuracy over and above the barrel quality. With 10,000rnds down the barrel have no doubt that the bullet will fly out of the barrel upon being shot, but certainly not acceptable accuracy for target shooting. Not for chrome lined or treated bores, but if you take a look down the bore after some 1000rnds. of normal chrome moly you will see metal fracturing, crystalizing of the surface at this early stage in it's life. Fiber optics bore scope will reveal lots of things that scare you. Rapid firing with associated heat will accelerate this wear and show up quickly.