Armstead broke his hand in the second quarter of Sunday's game against the Washington Redskins and will require surgery. Last year, Armstead was placed on injured reserve due to a shoulder injury.
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Armstead was the 17th-overall selection by the 49ers in the 2015 NFL Draft. He has started all six games this season and had 16 total tackles, 1.5 sacks, and a pass defensed. Over his three seasons with the 49ers, Armstead has 50 total tackles, six sacks, and a pass defensed.
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Paulsen appeared in each of the team's six games this season. He had no receptions this season and has been in on just 41 offensive snaps.