This should be dope practicing against MAILBOX...
— DARNELL DOCKETT (@ddockett) August 26, 2015The San Francisco 49ers are in Colorado facing the Denver Broncos in some joint practices, and the chance to face a great offense and defense could do big things for the 49ers. In particular, facing Peyton Manning and that Broncos offensive attack is a huge deal for the team's new-look defense. There are a lot of talented players on the 49ers defense, but they are learning a new system with Eric Mangini, and many of them are getting their first big opportunities.