A Marine veteran jailed for months in Mexico after trying to carry a family heirloom shotgun across the border has been freed, U.S. officials and his lawyer said late Friday. The attorney for 27-year-old Jon Hammar tweeted Friday night that his client had been released from a detention center in Matamoros, Mexico. “Jon is out, going home!” Eddie Varon Levy tweeted. … An aide to a legal representative of the Mexican attorney general’s office had told U.S. Sen. Bill Nelson’s staff about the pending release after the Florida Democrat’s office got word from Hammar’s mother, according to a press release...