I had a 39A in the early 60's and there were some "issues" right out of the box. One thing that bugged the heck out of me was that the receiver wasn't even close to 90 degrees from the receiver sides. Every time I looked down the barrel, I saw (or felt) that it was about 5 degrees off-perpendicular to the sides of the action. Maybe it wasn't that much off, but WHY couldn't the factory make a flat receiver top perpendicular to the flat sides??? The other nagging thing was that it failed to extract/eject empties all too often. Also, iron sights were poor, but mounting a receiver sight only drew attention to the receiver top's "cant".
Did the rifle shoot straight? YES it did! Was it fun to shoot? Yes, dang it! Then why did the problems cause you to eventually get rid of the fine-shooting rifle? I can't stand it that something that's supposed to shoot-straight had such poor manufacturing quality controls!!! The fact is that the nice rifle "kicked me in the head", every time I used it. I have other rifles/handguns that are PERFECT as I expect each to be, and for a lot less money.