Soul group from Chicago, Illinois, founded by brothers Rick & Rory (Star) Sizemore in 1978.

The band was named "Seville" until 1980 when they were introduced to Carl Davis (CEO) of Carl Davis Productions and Chi-Sound records. He asked them to change their name because someone else was recording under the name Seville already. Their first hit recording was "Share my love", written by Ric and Rory (Star) Sizemore and recorded in Universal Studios in Chicago 1982.

Line up: Rick "Star" Sizemore (bass and vocals), Rory "Star" Sizemore (keyboards and vocals), Nathaniel Williams (lead vocalist), Myron L. Robinson (drums), Mark Vines (saxophone), Carl "C-Bone" Colmer (trombone), Kenny Anderson (trumpet), Dwayne Lidell (lead vocalist), Stan "Skibby" Winfield (lead and rhythm guitars, vocals).

Magnum Force opened for groups like: The Dazz Band, Heatwave, Lakeside, Enchantment, Slave, Midnight Star, The Emotions, The Staple Singers and others.