San Francisco 49ers defensive linemen Glenn Dorsey, left, and Arik Armstead stretch during the team’s NFL football training camp in Santa Clara, Calif., Sunday, Aug. 2, 2015.
San Francisco 49ers defensive linemen Glenn Dorsey, left, and Arik Armstead stretch during the team’s NFL football training camp in Santa Clara, Calif., Sunday, Aug. 2, 2015. Jeff Chiu AP
San Francisco 49ers defensive linemen Glenn Dorsey, left, and Arik Armstead stretch during the team’s NFL football training camp in Santa Clara, Calif., Sunday, Aug. 2, 2015. Jeff Chiu AP
49ers with Matt Barrows

49ers with Matt Barrows

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Arik Armstead has ups and downs in 49ers debut

August 16, 2015 05:08 PM