Based on this product's specifications, here are some alternatives and similar models
Mouthpiece GESIPA AccuBird / PowerBird / Taurus Standard 17/27
Summary description:
Standard mouthpiece compatible with GESIPA AccuBird, PowerBird and Taurus rivet guns, size designation 17/27. Designed to fit the indicated tool models, it provides correct alignment and secure seating of rivets during fastening operations. Ideal for maintenance, replacement or spare-part use in workshop or industrial settings where these GESIPA models are operated.