How much federal land is suited to medium-to-high density housing? Very little. Mostly you'll see this going to build vacation homes and mansions for the wealthy. And who will get rich off it? Developers. How many congressmen and senators are developers or have developer buddies? Almost all of them.
So he voted for a bi-partisan background check bill (which ~86% of Americans support), and then nothing else that's relevant to this "is he coming for your guns" discussion. Got it.