Los Santos gets a lot more interesting when your loadout stops being a limitation. The GTA 5 gun code, 1-999-866-587, gives Story Mode a full weapon-and-ammunition package in seconds, which is much quicker than driving to Ammu-Nation or grinding cash for a new firearm; players who want to balance that sandbox freedom with buy GTA 5 Money should still keep those as separate choices. This code is best used for testing missions, setting up cinematic shootouts, or seeing how long you can survive against a rising wanted level.

The Code That Actually Matters

On every supported version with phone inputs, open the in-game phone, choose the keypad, and enter 1-999-866-587. On PC, press the tilde key, type TOOLUP, and confirm. The loadout covers the main firearm categories, plus ammunition and basic throwable equipment, so you can swap from a pistol to an assault rifle, shotgun, sniper rifle, or rocket launcher without making a store visit.

There are a few limits. This is a Story Mode tool, not an Online feature, and it doesn't create endless ammunition, improve accuracy, buff reload speed, or permanently change a character's skills. Calling it again can refresh ammunition for the included gear, but the effect belongs to the current session rather than your long-term progression.

Pick the Effect for the Scene

My Favorite Loadout Combinations

Explosive rounds are the loud option: fire at vehicles, barricades, or clustered enemies and watch the scene escalate instantly. Flaming rounds are more theatrical and work nicely for a night-time escape, while slow-motion aiming rewards careful headshots rather than pure DPS. Invincibility gives you room to test weapons, but it also removes the pressure of cover, armor, and escape routes. From what I've seen, using one special effect at a time produces more interesting experiments than stacking every effect together.

Save First, Then Make a Mess

Codes can disable trophies and achievements for the active session, so create a manual save before opening the sandbox. Reload that clean save when you want ordinary mission progression again. The practical routine is simple.

Save in free roam before entering any code.
Move away from your personal vehicle and nearby civilians before firing explosive rounds.
Equip a firearm before testing flaming or explosive ammunition.
Use free roam rather than a restricted mission checkpoint.
Reload the clean save before chasing normal story progress.

Why It Sometimes Fails

The usual problem is mode confusion: Story Mode accepts the weapon code, while GTA Online does not. A mistyped phone digit is another common culprit, especially in the longer ammunition numbers. Mission restrictions can also block certain effects, so return to free roam and try again. I could be wrong but, on PC, the console key layout can vary, meaning the tilde key may require a different keyboard key. The phone method is usually less fiddly across console versions.

Use It as a Sandbox, Not a Crutch

The gun code is strongest when you give it a job: replay a favorite set piece with a different build, stage a police chase, or test how vehicles react to specialized ammunition. It isn't a substitute for GTA 5's progression, and it can't solve poor positioning once the temporary effects end. Keep one clean save, choose a single combat theme, and let the chaos run for a while before resetting. That approach keeps Story Mode's challenge intact while still giving you room to experiment, and players who want extra financial flexibility can separately check Grand Theft Auto V Money without confusing it with the weapon code.