Good day to you, sir or madam, (but likely "sir").  I've got a quick custom Airsoft AEG upgrade tip for tuning your beloved rifle.  Wanna know what it is?  No.  Well you're offensive.  And rude.  So double offensive.  For those of you who do want to know, just keep reading.

I'll be honest.  This is one of those custom AEG upgrades that just makes sense to me, although I am not sure if I could produce a reliable test to say for sure.  But the whole concept is based on friction and how I don't feel it should have a place inside my gearbox, specifically, in this case, between my AEG's gearbox and the AEG Piston contained therein.    

Friction on the piston can reduce, even if only ever-so-slightly, your rifle's velocity output, measured in feet-per-second (FPS).  Friction can also create other issues, damages and mishaps inside the gearbox that make me angry.  BTW, you wouldn't like me when I'm angry.  Heck, I don't even like me when I'm angry.  So in order to avoid that anger, I've gone ahead and taken an extra step in attempting to reduce this friction I speak of.  
Traditional school of thought tells us to just throw some form of synthetic lubricant (usually a white-lithium grease) on the piston rail inside the gearbox and be done with it.  However, I'm a perfectionist and don't believe that the lubricant could be providing its maximum benefit if either the surface of the gearbox rails are fairly rough or the surface of the piston rails is rough.  Or both. 

So, in conversing with one of my very good friends one day, we came upon this issue in our discussion and he suggested I try polishing the gearbox rails with my Dremel to really give them a nice clean and smooth surface for the piston to travel upon.  He explained some of the things I've just explained and I was like, "Dang.  That just makes too much sense."  So I did as he told me, and within minutes, I had a cleaner, smoother and shinier surface upon my gearbox.

Click for a larger view of the rails
polishing AEG gearbox piston rails, AEG upgrade tips, Custom Airsoft Guns, Custom Airsoft AEGs, Airsoft Gun Reviews, Pyramyd Airsoft Blog, Tom Harris Media, Tominator
Polishing your AEG's gearbox piston rails will allow faster cycling from less friction.
Polished rail on the left, unpolished rail on the right.
Tom Harris for the Pyramyd Airsoft Blog
If you view the enlarged photo above, you can compare the polished rail on the left side versus the unpolished rail on the right and notice at least some level of difference in the surfaces.  The left one appears smoother and much more reflective in the light then the right side.  I've also applied my Dremel's polishing bit to the concave sides of the gearbox that may also come in contact with the piston during its cycle.  This shouldn't be happening very much if your gun is set up properly, but I figured, "What the heck?  I've already got the Dremel fired up anyway."

Tools used:
Dremel 4000 rotary tool
Fuzzy white polishing wheel
Dremel polishing compound, first applied to the wheel while it was spinning, then applied on the gearbox surfaces.

You don't have to have a Dremel for this project.  If you know what you're doing, you can probably acheive the same results using other methods of polishing as well (Google is your friend), but I used the Dremel because it's what I had available to me, not because anyone is endorsing me to do so.  

I basically started with a matte grey gearbox surface, with a bit of visible marks of wear & tear (as see on the rail of the right half of the gearbox in the photo above).

I simply continued to apply the polishing wheel until the surface of the gearbox I was polishing appeared to take on more of a shiny aluminum surface, as if it were fresh out of the CNC machine.

Since this gearbox is part of an ongoing project I'm still working on, I have yet to put it all back together to test because I'm still waiting for some other parts to arrive necessary for proper reassembly.  But I think you get the idea at this point.
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