San Francisco 49ers outside linebacker Ray-Ray Armstrong sings as he stretches as players prepare to take part in drills against the Denver Broncos during the team's joint NFL football training camp session Thursday, Aug. 18, 2016, in Englewood, Colo.
San Francisco 49ers outside linebacker Ray-Ray Armstrong sings as he stretches as players prepare to take part in drills against the Denver Broncos during the team's joint NFL football training camp session Thursday, Aug. 18, 2016, in Englewood, Colo. David Zalubowski AP
San Francisco 49ers outside linebacker Ray-Ray Armstrong sings as he stretches as players prepare to take part in drills against the Denver Broncos during the team's joint NFL football training camp session Thursday, Aug. 18, 2016, in Englewood, Colo. David Zalubowski AP

49ers notes: LB Ray-Ray Armstrong to go on IR with chest injury

September 20, 2016 10:28 AM