Tier 4 Part

Part	Drop from	Armor upgrade	Weapon upgrade
Optic Scope	Infinity mines Level 1	N/A	Scoped
Polymers	Infinity mines Level 2	Shock protection	N/A
Goretex	Infinity mines Level 3	Firegecko's enhancement	N/A
Carbon Polymer	Infinity mines Level 4	Regeneration	N/A
Recoil Absorber	Infinity mines Level 5	Laser reflector	N/A
Cylindrical rotary lock	Infinity mines Level 6	N/A	Bonus ranged damage
Electric Motor	Vault 12	N/A	Bonus max damage
Delinker Mechanism	The Tunnel	N/A	Bonus attack speed
High Tech Gunpowder	Abbey	N/A	N/A
Auto-Trigger	Area 51‎	N/A	Killing spree
Engine	Warehouse‎‎	Mirror system	N/A
Semi Trigger	Tanker Basement‎‎	N/A	Fast trigger
Gun Control Module	The Temple	N/A	Destroyer
Microchips	Laboratory X7‎	Utility Heavy stonewall	N/A
Mine Parts	Cathedral‎	N/A	N/A
Capacitors	Mariposa Military Base‎‎	N/A	Smasher!
Ceramic Plate	Talchem California HQ‎‎	Fill the gaps	N/A
Kevlar	Glow	Heavy	N/A
Plasma Accelerator	Vault 15‎	Defensive belt	Slayer
Wires	Waterworks‎‎	N/A	Penetrate
Plasma Transformer	Slavery Vault‎	Bonus move Speed mechanism	N/A
Electrical Transformer	Hawthorne Military Base	N/A	More critical
Steel Plate	Paradise Valley‎	Gain luck	Spiked
Leather Hide	Ares Rocket Silo	Cured	N/A
TX-28 Microfusion pack	Ares Rocket Silo	Special force bonus	N/A
Advanced Polymers	Vault 13	Gain strength Gain endurance	N/A
HiFlo Hydraulic Systems	Vault 13	Tesla addition	Poisoned
Unique plasma parts	Vault 14	N/A	Better critical
Polycarbonate	Vault 41	Gain intelligence Gain agility	N/A
Electromagnetic Mechanism	Vault 41	N/A	Long range
Glass Polymers	Sierra Army Depot	Gain perception Gain charisma	N/A
Electric Amplifier	Sierra Army Depot	Sneaky	N/A
Enchanced Servomotors	Navarro	Anti-thermal system	N/A
Rotary Chamber	Navarro	Iron skin	Chip shot
Advanced Shell	Event Encounter	Defence enhancement	N/A
Carbon Polymer Barrels	Lost Signal tier I	Lethal protection	Bonus min damage
T-51b Shell	Lost Signal tier II	Advanced plate	N/A