Sniper Scope for M1 Garand - 150 kills (M1 Garand).

Sniper Scope for Kar98K - 25 kills (Kar98K).

Sniper Scope for Arisaka - 25 kills (Arisaka).

Sawed-Off Shotgun - 75 kills (Double Barreled Shotgun).

Round Drum for Thompson - 150 kills (Thompson).

Round Drum for PPSh-41 - 75 kills (PPSh-41).

Rifle Grenade for Springfield - 75 kills (Springfield).Rifle Grenade for Mosin-Nagant - 150 kills (Mosin-Nagant).Rifle Grenade for M1 Garand - 100 kills (M1 Garand).Rifle Grenade for Kar98K - 150 kills (Kar98K).

Rifle Grenade for Gewehr 43 - 150 kills (Gewehr 43).

Rifle Grenade for Arisaka - 150 kills (Arisaka).

Grip for M1897 Trench Gun - 25 kills (M1897 Trench Gun).

Grip for Double Barreled Shotgun - 25 kills (Double Barreled Shotgun).

Flash Hider for SVT-40 - 25 kills (SVT-40).

Flash Hider for STG-44 - 25 kills (STG-44).

Flash Hider for M1A1 Carbine - 25 kills (M1A1 Carbine).

Flash Hider for M1 Garand - 25 kills (M1 Garand).

Extended Clip for Type 100 - 25 kills (Type 100).

Dual Magazines for MP40 - 150 kills (MP40).

Box Magazine for M1A1 Carbine - 150 kills (M1A1 Carbine).

Bipod for Browning M1919 - 25 kills (Browning M1919).

Bayonet for Type 99 - 75 kills (Type 99).

Bayonet for Springfield - 25 kills (Springfield).

Bayonet for Mosin-Nagant - 75 kills (Mosin-Nagant).

Bayonet for M1A1 Carbine - 100 kills (M1A1 Carbine).

Bayonet for M1897 Trench Gun - 75 kills (M1897 Trench Gun).

Bayonet for M1 Garand - 75 kills (M1 Garand).

Bayonet for Arisaka - 75 kills (Arisaka).

Aperture Sight for Type 100 - 25 kills (Type 100).

Aperture Sight for Thompson - 75 kills (Thompson).

Aperture Sight for SVT-40 - 75 kills (SVT-40).

Aperture Sight for STG-44 - 75 kills (STG-44).

Aperture Sight for PPSh-41 - 25 kills (PPSh-41).Aperture Sight for MP40 - 75 kills (MP40).Aperture Sight for M1A1 Carbine - 75 kills (M1A1 Carbine).Aperture Sight for Gewehr 43 - 75 kills (Gewehr 43).Get a certain number of kills with the weapons listed below for the desired upgrade(s): If you are invited to play a co-op Zombie Mode game it will be unlocked on your profile afterwords.

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