It is a banned rifle, the first one on the list under "Century Arms."
The list also is not all-inclusive of all banned rifles since new variations hit the market each year. It is only specific rifles that were put forth to MDSP for adjudication since some rifles are very similar to banned rifles without actually meeting the criteria for a banned rifle. For example, an AK look-alike with a short-stroke gas system or an M14/M1A in a different caliber (6.5 CM).
I assume that you mean the "list" that MSP has on their website? That list is NOT legally binding and means nothing. MSP has said that it is just intended as "helpful guidance."
A rifle is only banned if it is on the named list, or is a copy (defined as having completely interchangeable parts) of a rifle on the named list, or if it fails the copycat test.
The C308 is not named on the list. The C308 does not have completely interchangeable parts with any rifle on the list, and the C308 (in fixed stock form) does not fail the copycat test.
Therefore the C308 is not banned in MD, no matter what the MSP site says.