Apocalypse: My Items Can Upgrade Infinitely

The Sun disappears, an Alien Insect Swarm attacks, and humanity falls into a dark age.
"Shoddy Pistol Lv. 1/9, Damage 3, Effective Range 15 meters"
After dealing effective damage ten times, it can be upgraded to:
"Normal Pistol Lv. 2/9, Damage 4, Effective Range 30 meters, activates Extra Attributes: Bullet Recovery 1/1h"
Facing the overwhelming and sky-filling Swarm, Lin Feng obtains an Item Upgrade System that allows his bound equipment to accumulate Upgrade Points by killing enemies, achieving infinite equipment upgrades.
Pistol → Blast Gun → Nuclear Cannon... → Star-Annihilating Cannon
Upgrading can also grant Extra Attributes: Bullet Recovery, Spatial Magazine
RV → Armored Vehicle → Mobile Fortress... → Cosmic Battleship
While others are still struggling to survive, Lin Feng is already driving an armored vehicle, holding a Blast Gun with infinite bullets, and enjoying the fun of grinding monsters to upgrade.