Used XO / JUPITER Gun Grip One-owner item (me). By simply replacing the 3rd valve's bottle cap with this gun grip, you can hold the trumpet in a way that's like holding a pistol under the valve. This posture prevents unnecessary pressure on the lips, which helps prevent fatigue. Also, the sound resonates within the gun grip (hollow space), resulting in a softer tone. Furthermore, this posture naturally angles the bell slightly upwards, improving the visual appearance while playing. If anyone is interested, please let me know. Thank you. m(_ _)m