Another option to talk about sitting down at the camp fire is getting a FTK from guarder. They include pretty much every component that can be upgrades inside the mechbox and comes with Super-Lube which many consider to be an excellent lubricant. The Guard FTK's come with (for the M4 variant):
- SP120 Spring ( Oil Quenched/Tempered Si-Cr Alloy Steel Wire )
- Polycarbonate Piston
- Air Seal Nozzle
- Ball Bearings Spring Guide
- Polycarbonate Ventilation Piston Head
- Stainless Cylinder Head
- Lucid Chromium Plating Cylinder
- Original Type Steel Gear
- Enhanced Tappet
- 6mm Steel Bushing
- Shim Set
- SUPER-LUBE Oil X3
This has a polycarb piston and piston head for durability and light weight (less stress on mechbox and faster rate of fire), but also a better then stock tappet plate as they often break, a nozzle with an o-ring inside to help with consistent air flow and better air seal from the cylinder assembly to the hopup. The gears are made of a much harder material then stock and from my own experiance they run and wear very well as long as you shim up your gears correctly.
The only thing is the spring that comes with this kit will make your gun run pretty hot so you may wish to opt out and go for a lower power spring such as a Prometheus ms100 or ms110 (check Illusions spring chart for a better comparison of what springs can give you what results.
Link To Spring Chat You can still use the spring which is included in the kit at your choice, however as said above; the stronger the spring, the more stress is on your mechbox.