Based on the user reviews, here are three pros and three cons of the Gun Master 3D app: **Pros:** 1. "Addictive gameplay with smooth controls and stunning 3D graphics." 2. "Large weapon selection with unique abilities to master." 3. "Online multiplayer mode for competitive gameplay and socializing." **Cons:** 1. "Not enough variety in game modes and levels to keep players engaged." 2. "In-app purchases for premium currency and items can be frustrating." 3. "Lack of customer support and frequent bugs leading to frustration." Please note that these cons and pros are based on the opinions expressed by users in their reviews and may not be representative of all users' experiences.