The timing could not be better. President-elect Donald Trump and the Republican-controlled Congress are zealously committed to the National Rifle Association’s regressive “safety” agenda of marketing guns to more and more citizens. As a candidate, Mr. Trump talked favorably of people arming to defend themselves in gunfights.

The coalition faces a crazy quilt of state and national gun laws. But it has the resources and legal talent to persist, and more firms are expected to join, according to one of the founding groups, the Law Center to Prevent Gun Violence.The law firms are applying classic pro bono legal skills, and their efforts will be highly coordinated.

The legal fight has been made difficult by Congress’s decision in 2005 to shield the arms industry from damage suits — an outrageous protection no other industry has. But the coalition is considering new approaches, drawing upon public safety, antitrust and property laws to tackle problems like the widespread legalization of guns in public places and commercial establishments. Another concern is the pre-emption of local gun ordinances by state laws approved by politicians in the sway of the gun lobby.

These legal struggles are expected to be incremental rather than sweeping in their effect. But at least the N.R.A., which supported Mr. Trump’s candidacy with $30 million in ads, will be facing a potent new adversary. A nation appalled at Congress’s indifference to gun violence can only be heartened.