Collections

"Collections" is a part of the February 3rd, 2015 update to SAS: Zombie Assault 4. Collections is a record of the weapons and armor obtained throughout your character's lives.

Rewards
The rewards of the collections are obtained by collecting all weapons of a specific category. Each category of weapons' rewards (obviously) only apply to weapons in that category.
 * Pistol Rewards:
 * +20% Range
 * One Promethium Strongbox and 5% Faster Reload
 * Black (None)
 * Assault Rifle Rewards:
 * +10 capacity
 * One Nantonium Strongbox and 5% Damage
 * Black One Black Strongbox and +3% Critical Chance
 * Shotgun Rewards:
 * 5% Damage
 * One Molybdenum Strongbox and +5 Capacity
 * Black One Promethium Strongbox and +1 Pierce
 * Sniper Rifle Rewards:
 * +5 Capacity
 * One Molybdenum Strongbox and +10% Critical Damage
 * Black One Promethium Strongbox and +5% Damage
 * SMG Rewards:
 * +20% Range
 * One Promethium Strongbox and +5% Fire Rate
 * Black One Nantonium Strongbox and +10% Damage
 * Rocket Launcher Rewards:
 * +5% Radius
 * One Promethium Strongbox and +5% Reload Speed
 * Black One Nantonium Strongbox and +10% Damage
 * LMG Rewards:
 * -5% Movement Penalty
 * One Promethium Strongbox and +5% Capacity
 * Black One Nantonium Strongbox and +10% Rate of Fire
 * Laser, Flamethrower, Disc Thrower:
 * (None)
 * (None)
 * Black (None)
 * Full Weapons Reward:
 * Five Thulium Strongboxes and 200,000 SAS Creds
 * Five Nantonium Strongboxes and 400,000 SAS Creds
 * Black Five Black Strongboxes, Five Black Keys, and 750,000 SAS Creds
 * Full Armors Reward:
 * Five Thulium Strongboxes and 200,000 SAS Creds
 * Five Nantonium Strongboxes and 400,000 SAS Creds
 * Black Five Black Strongboxes, Five Black Keys, and 750,000 SAS Creds

Other Facts

 * The rewards from collections are account-wide, and the progress is also account-wide.
 * Weapons obtained and sold before the collections update do NOT count towards collections progress.
 * Very low level characters seem to not receive the collection rewards that yield Strongboxes other than the full weapon and armor collections.