I'd say if there's anything you want that holds more than 10 rounds, buy it yesterday. Even if there's zero gun control passed, mag and semi-auto gun prices are about to go through the roof, just like they did for at least the first 2+ years of Obama, panic buying will be the norm regardless of what passes. Already too late for ammo, mark my words, it will be years before that's back to normal now. Biden's aids have already outlined he's going after "assault weapons", high capacity mags, and to try and limit ammo/mag/parts sales over the internet in the last couple days. Guns are a major part of both his and his VP's agenda on day 1, doesn't matter if he can pass anything, it simply being on the news will drive panic buying, and zero supply.
Gun and Ammo companies are probably quietly very very happy. Nothing increases prices and sells more guns and ammo like Democrats gaining more political control. I bet we smash recent record gun sales starting this month and continue to do so.