San Francisco 49ers defensive end Arik Armstead (91) reacts after sacking Cincinnati Bengals quarterback Andy Dalton during the first half an NFL football game, Sunday, Sept. 15, 2019, in Cincinnati. (AP Photo/Gary Landers)
lessSan Francisco 49ers defensive end Arik Armstead (91) reacts after sacking Cincinnati Bengals quarterback Andy Dalton during the first half an NFL football game, Sunday, Sept. 15, 2019, in Cincinnati. (AP
... more Photo: Gary Landers / Associated PressThe San Francisco 49ers have agreed to terms with free agent defensive lineman Arik Armstead on a long-term contract, according to multiple reports.