Upgrades: Aim/Evike full gearbox $120 Reinforced shell (properly radiused and shimmed by for max efficiency/durability) 8mm bearings Steel rack high speed piston High speed gears Low resistance silver plated wiring Metal Hop-up chamber $20 ZCI 10.5” outer barrel $28 High torque motor $35 New G&G Nylon Fiber body- Polyamide not ABS (Across my 8 M4 platforms, these tough polymer bodies are more resistant to BB hits, drops, and damage than aluminum bodies) Durable, lightweight, perfect air-seal. Excellent all around platform Selling most of my guns to cover unexpected medical expenses, feel free to offer what you feel is fair