End of the World: My Items Can Be Upgraded Infinitely

The sun disappears, alien swarms attack, and humanity falls into the Dark Ages.
"Low-quality pistol lv1/9, damage 3, effective range 15 meters"
After causing effective damage ten times in total, it can be upgraded to:
"Ordinary pistol lv2/9, damage 4, effective range 30 meters, activate additional attribute: bullet recovery 1/1h"
Facing the fierce swarm of insects, Lin Feng obtains the item upgrade system, which allows bound equipment to accumulate upgrade points by killing enemies, and achieve unlimited equipment upgrades.
Pistol → Bolt gun → Nuclear cannon... → Star destroyer cannon
Upgrades can also obtain additional attributes: bullet recovery, space magazine
RV → Armored vehicle → Mobile fortress... → Space battleship
When others are still running around, Lin Feng is already driving an armored vehicle, holding a bolt gun with unlimited bullets, enjoying the fun of monster hunting and upgrading.