Yeah, I get tired of telling liberals, what you really want is Second Amendment repeal. So say that instead of burbling about "assault weapons" (which is politician for tacticool-looking rifles generally of smaller caliber than many hunting rifles), "common sense gun law reform", etc. Because you're not getting much done and you're putting conservatives on high alert, and you'll get punished for it come election time.

Get the support. Repeal the amendment. Go full Lincoln: start implementing strict gun measures through statutes and EOs. Don't give a shit this time if conservatives get mad; if they threaten war, round them up and make examples out of them. And while the constitutionality battle winds its way through the courts, drag repeal toward the center of the Overton window until, like gay marriage, it becomes an obvious policy winner with overwhelming bipartisan support. Just in case, pack the court with liberal justices who will opine the RKBA back to a collective right which it was generally agreed to be until the far right took utter control of the NRA and the Republican Party.

Oh yeah, and sue, sue, sue. Sue gun manufacturers, ammo manufacturers, gun rights organizations, and politicians who voted and advocated against gun laws. The First Amendment only protects you from jail for your heinous speech; as we've seen with Alex Jones, it doesn't protect you from billion-dollar judgements if you choose to spread lies about the dangers of widespread gun availability, gun culture, and the violence these enable.