IMO,
Tikkamike has the 100% best advise period in BOTH posts.
Now, the fact that he has "violent tendancys", makes me agree, to ABSOLUTELY make HIM prove his ability to own them thru an FFL. & if he couldn't, then the FFL paying cash for them is gonna look like a good deal to him. You wouldn't be "that guy" with a Target on his back for turning them into the police.
As far as the felon thing goes,
We don't know if this guy left a bar & happened to have 2 beers in 1 hour, instead of 1, & now has a DWI/Felony. How many folks here have had 2 beers THEN drove home?
I'm not down playing the DWI thing, but I have a relitave that got HOSED for having LESS than the legal limmit, but a couple high crack heads ran a stopsign & wrecked him. Guess what, they refused to test, got booked, then let go. My relitave got charged with fault of the crash, got given a DWI, & cited as a FELON, for 2 beers, cause he co-operated with the cops.... Hmmm is hrs a "felon" now. Pure B.S.
Not ALL felons are bad people. SOME HOWEVER ARE VERY BAD.
We can't jump to conclusions, but, giving the guy options like the FFL /$ thing, leaves you, & your wife LESS FROWNED UPON BY A PERSON, (known by you, & your wife to be Violent on occasion), & also clears you of responsibility.
I'm not pittying the man. Bullying women deserves severe, & harsh punnishment imo, but I'm on the outside lookin in here, & I have no first hand knowledge or experience with this guy, you, or your wife, or his current wife, so I'm trying to be as objective ad possible here.
If he is what he sounds like, he'll never pass the background check, & the $ will look apealing to him. Plus the ATF won't have any reason to dislike you.... You are strictly going that route to CYA, even a bad guy can respect that.
If he does pass then he's legaly able to possess his "own" (court appointed) firearms, & the ATF still has no reason to dislike you. And like any good gun loving citizen, you legally CYA, & never had to get the law involved.
I'm from a small town, & we always handle things on our own unless its absolutely nesicary to involve law enforcement. Folks don't always get along or agree, but whenever the law gets involved, there is a deep division on who's side who is on in a small town. Those scars take a LOOOOONG time to heal.
Look, gun controll Nazi's love to have "weapons" turned into the police for ANY reason. Any reason at all to melt them down, & be used as statistics for twisted purposes, to promote anti gun crap.
If this guy is what he sounds like, & you take Tikkamikes advise, everybody wins, & no gun controll freaks get any victorys.