Table of contents
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• Proper handling of the screws
• The proper ways of taking things apart and putting them back

• Structural problem 1: a weak front barrel mounting structure
• Structural problem 2: fore grip insertion
• Structural problem 3: fore grip wobble
• Structural problem 4: the SD suppressor and the inner barrel
• Structural problem 5: the MP5K inner barrel
• Structural problem 6: Hop Up adjustment lever wobble
• Structural problem 8: high cap magazine reliability
• Structural problem 9: magazine wobble
• Structural problem 10: butt stock wobble
• Structural problem 11: battery compartment
• breakage and replacement  

• TM specific internal problems overview
• ICS specific internal problems overview
• CA specific nternal problems overview
• >UTG specific internal problems overview
• Special UTG Technote 1
• Special UTG Technote 2
• Special Golden Bow Hybrid Mechbox Technote<

• TM AEG: a baseline for performance measurement
• What is proper usage?
• key elements of a high FPS setup?
• Version 2 mechbox versus Version 3 mechbox: any difference in stock performance?
• FPS increase in meter readings VS performance increase in a practical sense: the law of diminishing marginal gain in performance.
• 0.20g BBs versus 0.25g BBs versus 0.30g BBs: the heavier the better?
• Does FPS always go hand in hand with Joule?
• What is the difference between the FPS system and the Joule system?
• How do you use FPS to measure Joule?
• How do you use FPS to give an estimate of the range?
• Higher FPS = ower ROF?
• Softer spring = Higher ROF?
• Harder spring = Lower ROF?
• Is 8.4V insufficient for an upgraded mechbox?
Does battery size matter?
• Is battery power important for semi-auto firing?
• EG-700, EG-1000, ICS Turbo 2000 and the UTG motor
• Why (and why not) should I buy the high torque gear set?
• Why (and why not) should I use helical gears?
• Why (and why not) should I keep the stock plastic bushings?
• Why (and why not) should I replace the stock plastic bushings with metal bushings?
• What is an easy way to (more accurately) shim?
• How do I tell if shimming has been done correctly?
• What is the recommended order of gear insertion?
• Longer spring versus shorter spring: the longer the better?
• What are the major parameters of a spring?
• >Is a harder spring more harmful for the internals?
• Installing a long spring: tricks and potential danger.
• Installing a short spring: tricks and potential danger.
• Why (and why not) should the spring be ground?
• How to facilitate spring spinning?
• What is a variable pitch spring? Is it always better for AEG?
• Use of spacers for spring compression: tricks and potential danger.
• What is wrong with a custom made spring?
• Systema Springs versus PDI Springs
• Can stainless steel spring offer better FPS?
• Can Telfon Coated spring offer better FPS?
• The long variable-pitch spring is very difficult to install. What should I do?
• What can I do to reduce stress on the gears?
• Can an EG1000 increase FPS (through higher torgue) over an EG700?
• Why (and why not) should I use a Bore-Up Cylinder?
• Why should I replace the stock cylinder on my MP5K / PDW?
• Different guns use different cylinders that have different number and position of openings. Why's that?
• Is it useful to block the cylinder opening altogether?
• Why is it useful to put holes on the piston head? Any alternative?
• Why (and why not) should I use a metallic piston head? How about a silent head set?
• Is aluminum piston more durable?
• Is version 2 mechbox too fragile for M130 or above?
• Do I need a heatsink motor plate on upgrade that involves M140 or above?
• How do I effectively reduce heat on the motor?
• Why (and why not) is the one o'clock gear timing an issue?
• Can I still use the smaller batteries to power my upgraded mechbox?
• I want to hide my battery inside the grip and the stock but the battery cells are too big. What should I do?
• Chaining up your batteries: Parallel VS Serial configurations.
• Should I use Sanyo battery cells for maximum performance?
• How safe is it to remove the fuse? Any alternative?
• Do I need a etal body to sustain the upgraded power?
• Why (and why not) is it necessary to replace the stock wires?
• Why is it necessary to shorten the wires?
• Can I use stereo wires instead?
• Why (and why not) is it necessary to replace the stock Tamiya connector?
• Are NiCd batteries superior to NiMH batteries for driving upgraded EG?
• How do I optimize the overall performance of the stock motor?
• Is it possible to increase the torque of the stock motor? If so, how?
• What else should I buy for a high FPS configuration?
• What is wrong with the soda can test?
• What is right with the soda can test?
• What is the most accurate way to measure FPS?

• What are the key elements of a high ROF setup?
• Can I increase the ROF while keeping the FPS at the stock level by using 9.6V battery?
• Voltage VS mah - which one matters the most?
• Can I increase the ROF by replacing the mechanical contact switch with a solid state switching mechanism based on MOSFET?
• Can I increase the ROF by using capacitors at the power source?
• Is high ROF a major cause of tappet plate breakage?
• ROF-wise, why (and why not) should I replace the stock plastic bushings with metal bushings?
• How about oil channel bushings?
• Why (and why not) should I buy the high speed gear set?
• Should I upgrade to a Teflon Cylinder? How about a high speed cylinder set?
• What makes a ball bearing spring guide meaningless for a stock TM gun? How to work around?
• Is there any cheaper alternative to ball bearing spring guide?
• Why a ball earing spring guide alone may not increase the ROF?
• Can I use a Version 2 spring guide in a Version 3 mechbox?
• Should I upgrade to an EG1000 for higher ROF?
• >How do I optimize the stock motor's RPM without spending major $?
• How can I increase the ROF while keeping the FPS at near-the-stock-level?
• What is the right type of spring and battery to use for this purpose?
• Is ROF over 30/sec possible? What is the major ROF bottleneck?
• Is aluminum piston better off for a high ROF configuration?
• Are lighter gears better off for a high ROF configuration?
• What else should I buy for a high ROF configuration? Can I increase ROF by cutting off some teeth from the piston and the gears?
   

• >What are the key elements of a high accuracy setup?
• How to improve accuracy with short barrel?
• Can a long barrel deliver higher accuracy and range?
• Why (and why not) should I replace the stock cylinder when using a longer inner barrel?
• What is good about a high precision barrel?
• How to maximize the effectiveness of a high precision barrel?
• What is the drawback of using a high precision barrel?
  How do I hide the longer inner barrel?

• >My stock TM MP5 is dead after 3000 shots. Why?
• What will happen with improper shimming? And what should I do to remedy the problem?
• How do I prolong the life of the mechbox?
• When the mechbox is running, the nozzle does not move at all. What is wrong?
• My mechbox got stalled after replacing the tappet plate. What's wrong?
• My gun stopped working in semi-auto mode. What's wrong?
• What cause the piston gear to break prematurely?
• My EG1000 was overheated. What should I do?
• What should I do for proper motor maintenance?
• What cause the strange noise from the motor and/or the motor gear?
• The two screws that attach the mechbox to the lower receiver are completely stripped. What should I do?
• What causes gear stripping?
• What can cause the hopup rubber to break?
• How to prolong the life of my battery?
• Is slow charging always good for my battery?
• How to safely charge a battery?
• Is NiMH battery free from the memory effect problem?
• Should I ully discharge the battery every time after use?
• How do I fix the battery memory effect problem?
• My gun keeps mis-firing. How do I tell if this is a magazine problem or a mechbox problem?
• I suspect hat the hi-cap magazine is not working. What should I do to fix it?
• What causes air leakage?
• What causes double feeding? My gun makes an unwinding noise after full auto firing. What's wrong?
• How about "Changing the Polymer Internals with the ICS Metal Internals"?
• Can I mix and match the receivers of TM/UTG and ICS?
• Is there a RAS kit available for the MP5K?
• Are the accessories for G3 and MP5 interchangeable?