Mustang Arms Close-Control 20

Mustang Arms Close-Control 20 is utilitarian shotgun comes from the Night City-based firm Mustang Arms. Composed of lightweight composite materials, the C-C 20 is designed as a reliable antipersonnel weapon which won't devastate an enclosed area. The Close-Control 20 is a semiauto 20-Gauge bullpup, loading buckshot, slugs, anti-riot baton rounds, or flechette shells. Its clear plastic box magazine holds 15 rounds, and the entire weapon is only 66cm in length.

Source

 * Solo of Fortune 2, pg.33
 * Blackhand's Street Weapons, pg.22