The WW2 barrels look pretty grim outside (like they were somebody’s school shop project), but they were actually made better than the “classic” WW1-1920s barrels of the Springfield’s glory days. Broach rifling (as opposed to scraping the grooves out, one at a time, which was inconsistent) and air-gauging the bores made a world of difference.
I recently (about a year and a half ago) picked up from a widow a Krag Jorgensen Springfield full stocked carbine (Philippine constabulary 1902 cartouche). It shoots ‘ok’ but it looks immaculate. At the same time I got for my son a National Match Garand. The Garand is so darn accurate for a Garand as to be unbelievable. Because I spent all I was going to spend on guns that day I had to pass up a 1920’s O3, Pre A1 in immaculate condition. A gunsmith friend bought the rest of the collection of 18 or so long Guns for 1 fixed price. A tear came to my eye over missing the 03 because buying in bulk the average price was way less than I could have possibly, in good faith, offered her. She actually was happy as most of the other rifles were worth little. I got 2 of the 3 best.