In the Interstellar Era, I Smashed Space Battleships with My Pistol

At the first Interstellar Alliance Universe Conference, the Interstellar Alliance was honored to have Lin Tianle, the most legendary figure in human history, give a speech. Reporter: "Mr. Lin, it is said that the space battleship larger than a galaxy was destroyed by you on the battlefield at that time. How did you do it?" Lin Tianle: "This is not difficult, it just requires a little help from outside." The reporter was surprised and guessed: "Did a quantum destruction wave cannon be used? Or a super-dimensional cosmic annihilation laser?" Lin Tianle shook his head: "None of them." The reporter was even more surprised: "Did you use the legendary Purgatory Unparalleled Wave Cannon that can destroy everything?" Lin Tianle: "That kind of legendary thing doesn't exist at all." Reporter: "Then what did you rely on to destroy that monster battleship?" Lin Tianle smiled faintly and slowly took out a black pistol: "Just rely on it." The reporter was surprised and confused: "This is... An invincible interstellar weapon that looks like a pistol?" Lin Tianle shook his head again: "No, it's just a pistol." Lin Tianle, a junior student from Wa, traveled to the interstellar era due to an accident. Faced with various crises, how did he reach the top step by step? The introduction is too weak, please move to the main text.