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AOE spacing

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I'm in the process of upgrading some of the internals in my SCAR and want to set the AOE correctly. I shaved off the 2nd tooth and half of the third. The stock AOE is quite a bit off as you can see in this first picture. Note the black mark on the piston rail:

 

IMG_1931.jpg

 

 

When I slide the piston out to correct the AOE it moves a distance of about 4 mm, or 1/8":

 

IMG_1929.jpg

 

Is this typical? Seems like it is quite an adjustment and you can see that the sector gear is not perfectly parallel. If I accomplished this with spacers there would not be much of the piston head sleeve remaining in the piston. Sorbothane would be the alternative but I can't find anyone that sells the nice pre-cut pads. Should I be correcting the full 1/8"?

 

Upgrades include: Systema M120 spring, polycarb piston, prometheus high-speed gears.

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The aluminum one will just cause more wear and tear on your gearbox. Not really a good thing until you get into super high power levels where poly carb would possibly fail.

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