There are no guarantees. Even assuming that a ban made it through the house (highly doubtful), we don't know what will be in it right now. Feinstein's bill is the one most likely to see any kind of support, and she hasn't even submitted it yet. There's no telling what changes could happen between submission and signing, either.
Pre-ban parts (except magazines) were available during the '94 ban, it was just illegal to install them on ban-era rifles. However, this is zero indication of what could happen if (and that's a large IF) they manage to pass a new ban.
Never argue with an idiot. They will drag you down to their level and beat you with experience.