I got my answer on Arfcom where S&W has an official representative...
M&P10 Barrel Options - AR15.COM
Essentially, YES, there are two barrel profiles for the M&P10.
The contoured pencil profile on the Tactical/LEO model and a straight profile medium barrel on the CAMO model.
S&W went on to say that you should be able to order the straight profile barrel from their parts and accessories department.