"Gun" were a moderately successful Scottish hard rock band formed in 1987 by brothers Giuliano (guitar) and Dante Gizzi (bass), with Mark Rankin (vocals), Scott Shields (drums) and Baby Stafford (guitar). Signed in 1989 by A&M Records, they released their debut album ''Taking on the World''. Mark Rankin's cousin Sharleen Spiteri, of fellow scottish band Texas contributed backing vocals to several songs on the album. The single "Better Days" from the album made the top 40 in the UK. Gun toured the US and supported The Rolling Stones on their European tour of 1990.
Alex Dickson replaced Baby Stafford before the release of their second album ''Gallus'', of which the single "Steal Your Fire" was a minor hit. Spiteri again contributed backing vocals to the album.
Both Alex and Scott left before the release of ''Swagger'', Giuliano taking over all guitar duties, and Mark Kerr (brother of Simple Minds singer Jim Kerr) replacing Scott. ''Swagger'' was easily their most successful album, propelled by the success of their version of "Word Up!", originally recorded by Cameo, the single of which was a top 10 UK hit and charted well in many other territories as well.