Kirk (calf) was a full practice participant Thursday, Nick Wagoner of ESPN.com reports.
Back-to-back full practices have Kirk trending in the right direction ahead of Sunday's game against the Falcons. The 49ers have until Saturday to activate Kirk from IR ahead of Week 7 action, but if he's available this weekend he'd provide a boost to a WR corps dealing with injuries to both Mike Evans (ribs/Achilles) and Deebo Samuel (hamstring).