As the painting instructor on PBS used to say "Happy little accidents"
I suspect, just a hunch, that occasionally it may also be a case of bumping into the right load or ammo with rifles. In my collection I have a couple of older rifles, that were never though of as particularly accurate, that both turned in back-to back (I HAD to shoot second groups) sub 1" groups with factory ammo when I was just trying to see if they had a bullet weight preference.
I still will not discuss the groups I got, repeatedly, with my SOCOM16 @ 100 yds with HTM "Tactical" loads. I think the shorter barrel and the slight changes to the gas system helped my particular assembly of parts, as it were,
I have found a couple of accurate guns in brands that are bashed but I just think the bashing was undeserved, not that mine are anything rare.
"Oh bother" said Pooh, as he punched the magazine release...
In some peoples minds "What if?" is just as real as What Is.
Think good thoughts about Ronny moving to the Netherlands ASAP