CONCORD, N.H. — New Hampshire’s House of Representatives has killed a bill that would have expanded background checks for gun sales and transfers to include gun shows, the Internet and flea markets.

Most private sellers would have been required to conduct background checks through federally licensed dealers, using a system already in place for dealer sales. Breaking the law would have been a misdemeanor charge. An exception would have been made for noncommercial private sales between individuals not prohibited by federal law from buying a gun.

Supporters argued it would protect citizens, but opponents said it infringed on gun rights.

The House voted 177-175 Wednesday to substitute a study for implementing the checks, but later voted 242-118 to kill the bill after supporters tried to postpone final action so they could salvage it.