The following will appear at the Hideout(s).

Effect - Code

AK-47 - Collect 50 Balloons
Armor - Collect 60 Balloons
Equalizer (Pistol with Scope) - Collect 80 Balloons
Flamethrower - Collect 70 Balloons
M249 Machine Gun - Collect 99 Balloons
Molotov Cocktails - Collect 40 Balloons
Pistol - Collect 10 Balloons
Scorpion (SMG) - Collect 20 Balloons
Sniper Rifle - Collect 90 Balloons
Stubby Shotgun - Collect 30 Balloons