Donald Jr is a competitive shooter and a reloader.
He has probably influenced his dad on the topic.
Yes, I remember Trump explicitly saying that his sons Don, Jr. and Eric have influenced him on the gun issue and helped move him in a more conservative direction on it over the years.
Regardless of the reasons, his current positions are what matter, not what he thought almost two decades ago (he has a policy paper on the Second Amendment on his website). I just find it illegitimate how so many in the press have been reminding people repeatedly about his old, no longer active support for an assault weapons ban, while avoiding any mention of how strongly he was in favor of law abiding citizens having guns for protection then, contrary to many restrictive laws like those of New York City and many other large cities and some states (I’m looking at you NJ).
I agree. Junior brought sanity to the argument with his father. The kid is well reasoned and can present a logical position.