All weapon upgrades free for Grand Theft Auto 5 - Xbox 360

• All weapon upgrades free

While a mission is active, go to the gun shop, and buy all of the upgrades for every available weapon and some grenade. Once you have obtained all of the upgrades, leave the gun shop, and use one of the grenades to kill yourself. This will cause the mission to fail, and you will start the mission over. When the mission restarts, you will have all of your money back from the purchases in the gun shop. Go back to the gun store, and all the weapon upgrades will still have a checkmark. Repeat this process when new weapons become available.

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