Durring the first season and a half or so, he carried a Dormas and Dixon Bren-Ten in a shoulder holster made by the Famous Jackass Leather Company. Parts for the Bren-Ten became an issue, so somewhere in the second season, IIRC, he switched to a Colt Delta-Elite 10mm. He continued to use the shoulder holster system. The Famous Jackass Leather Company is now known as Galco, and the holster that Don Johnson used is now called the Miami Classic.

Don Johnson also carryed a compact pistol in an ankle holster, I want to say it was a Colt 380, but I am not sure. He did use a Steyr-AUG rifle and a Stryker-12 shotgun in various episodes.