The 49ers have a new Swiss-Army Knife. In recent seasons that was the description Jim Harbaugh gave to Delanie Walker who was part tight end part fullback part wide receiver in the 49ers offense and who finished fifth on the team in receiving yards.

Walker is now a Tennessee Titan - he already has two touchdown catches - which means that his unique multifaceted role had to be taken on by others mostly fullback Bruce Miller. Walker was on the field for 57 percent of the plays last season. Miller has been in on 53 percent of the snaps through the first four games and has been lining up in some of the spots Walker once occupied
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"Bruce is like our Swiss Army knife he does everything from special teams to everything on offense" quarterback Colin Kaepernick said this week. "Whether it's blocking running catching passes he's someone that really makes this offense go and he's a vital part of it. So as he develops and as he continues to get better our offense will continue to get better as well."

Like a number of offensive players Miller struggled during the 49ers' recent two-game losing streak. And it was no coincidence that the 49ers signed another fullback Owen Marecic during that stretch.

But Miller bounced back strongly last Thursday against the Rams. (And afterward the 49ers released Marecic). He blazed ahead of Frank Gore on all of Gore's longest runs including the 4th-and-1 play that ended with Gore racing into the end zone for a 34-yard touchdown.

Miller also has had a bigger role in the passing game than he did during his first two seasons when Walker was around. Kaepernick usually makes a short throw to the fullback early in the game to help the quarterback find a rhythm.

Miller caught three passes for 22 yards against the Rams and he has eight catches for 78 yards on the season. The eight receptions are one fewer than the team's No. 2 wide receiver Kyle Williams.

The 49ers converted Miller from college defensive end to fullback when they drafted him in 2011. But he said he played tight end - and baseball -- in high school so catching a ball isn't all that foreign to him. "It's pretty cool" Miller said. "Especially if it's helping. Moving the chains third and short - I want to be effective. I don't want to catch balls just to catch balls. I want to be able to help the team."