The 49ers have signed 27-year old linebacker Marques Harris to a 1-year deal.  Harris played in 15 games for the Chargers last season and he made 28 tackles, had 2.5 sacks and he forced 2 fumbles.  Harris has now played in 56 games in his 4-year NFL career and he has made 81 tackles, has defensed 4 passes, has 8 sacks and he has forced 3 fumbles.  This was a solid addition for the 49ers as Harris still has a decent upside.