The San Francisco 49ers have acquired Maliek Collins from the Houston Texans for a seventh round pick.

Collins, 28, is San Francisco's fourth addition to the defensive line since the NFL's early negotiating window opened on Monday. The Niners have also agreed to terms with ends Leonard Floyd and Yetur Gross-Matos and with tackle Jordan Elliott.

In addition, the Niners are expected to release stalwart defensive lineman Arik Armsteadwhen the new league year opens Wednesday afternoon.