I Upgraded Alone to the Gunfire Apocalypse

Link is the lowest scavenger in the wasteland, with only a broken gun and a dying sister. Until that day, when he was dying in a desperate situation, his blood activated the [Gunfire Protocol] from the old era. As a result, there was a walking legend in the wasteland. Kill enemies and weapons will evolve. In his hands, the old P220 will eventually evolve into a god-killing weapon. And the only reason for him to move forward has never changed—— "Brother, when can I go home?" "Soon," he loaded the last armor-piercing bullet and looked through the ruins to the deepest part of hell. "When brother gets the medicine, he will take you home." Complete the mission and you will receive old technology. While others were still fighting for a mouthful of clean water, he had already used the potion rewarded by the system to hang his sister's life. Bandits, mutated beasts, and even former enemies have become the souls of his victims and food for evolution. However, as he becomes stronger, he discovers that he is not the only one who has obtained the system!