I bought all my guns from FFL dealers. I do not care if the government knows what I own, I bought them all legally, and I own them for lawful purposes only as a law-abiding citizen.
I would buy what you want to own now though, because if somehow a deal gets cut in the back room, a ban would be on future manufacturing and importation, so you need to consider that.
I honestly do not think a ban on semi-autos or high cap mags will pass even in the Democratically-controlled Senate, and it will definitely not pass in the Republican-controlled House.
The sexual-rainbow-freakshow-inclusive, LGBT-tolerant, entitlement-beholden, bleeding-heart, scared-of-guns, unwilling-to-kill-or-butcher-their-own-meat, mamby-pamby, panty-waist, subway-train-commuting, scooter-riding, whirly-gig-beanie-wearing, designer-jean-hoping, fake-fingernailed, hair-weave-wearing, lapdogs-as-fashion-accessories, Democrats, can drop dead.