ZCI entry level V3 complete gearbox.  Comes with a non-vented cylinder, non-linear M120 spring, stainless steel spring guide and old-style trigger block.  Ideally would need a reshim / regrease, new nozzle, ETU and gears, however works perfectly fine for stock AEG's

Features
- Steel QD spring guide with thrust bearing
- Top clamp
- Philips screws
- 14 tooth full steel racked piston
- Plastic nozzle (no o-ring)
- Nylon piston head
- Aluminium cylinder (no vents)
- Plastic cylinder head with flat pad bottom
- Standard mechanical trigger block
- Standard steel 18:1 gears
- Deans connector - rear
- 8mm bearings