From The Hill:

The bill, sponsored by Rep. David Cicilline (D-R.I.), would prohibit the sale, transfer, import and manufacture of hundreds of models of semi-automatic weapons that boast certain specific features, including those that combine pistol grips with detachable magazines. The ban would not apply to people who already own such weapons.

Those firearms rank among the most popular in the country, and opponents of the ban — including all but a handful of Republicans — say it would trample on the Second Amendment rights of law-abiding gun owners.