DES MOINES — Legislation to ease some gun restrictions and make Iowa the 19th state to adopt a permit-less constitutional carry approach drew cheers Monday from advocates as striking a blow for freedom, while critics called it an effort to unravel Iowa’s gun safety laws.House Study Bill 254, which cleared a House Public Safety subcommittee by a 2-1 vote, would eliminate the need for Iowans age 21 or older to obtain a government permit to acquire or carry a firearm.