I Have a Modern Weapon Gacha System in the Zombie Apocalypse

[P.S No AI is used for this book!]In the year 2025, a sudden outbreak happened where humans are turning into monsters that would feast on another human. The word is zombie. They appeared in all major cities on the planet infecting millions by the day.Among them was Adrian, a college student who was about to go home after his class when suddenly zombies appeared out of nowhere. Of course like every human being who sensed danger, he ran and escaped. But minutes after he killed a zombie, an holographic interface appeared.[Modern Weapons Gacha activated!][Would you like to try out your luck in a modern weapon gacha system?]Adrian tested it since there's nothing to lose.[Congratulations! You have received an M4A1 and a 5x fully loaded magazine!]With that, he found out that he has a gacha where he could potentially receive handguns, shotguns, assault rifles, machine guns, bazooka! Even a tank or an attack helicopter!With his new power, he would use it to kill zombies and hostile survivors, and save the people who were dear to him.And just like that, Adrian suddenly has a weapon to fight in a new apocalyptic world.