Woah.
So, she's selling his guns that he had promised his own children?
I don't think I'd think very well of my stepmom for selling a firearm my recently departed dad had taught me to shoot with. Jes' sayin.
That has nothing to do with you, and if offered I'd buy it too, but his kids are going to be rightfully pissed.
The way I see it, is if he gave it to them, they'd already have it, or it'd be in his will of whom it is to be given too.
But since they don't already have it, and if he doesn't have a will,
then it belongs to the woman he was married to when he died, to do whatever she want's to with it.
It's part's of the reason to have a solid legal will & only get married once.
the will say's what happens with your gear when you die,
and if that first marriage didn't last, then you're either a widow/widower or just a failure in marriage.
and one can see no sence causing misery and/or being miserable twice or more when one can live happily with a woman from then on, or till one or the other is unhappy,
Then the sheets split and boots get walking to the grocery store, bar or church to find a newer sporting or classic model.