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Old July 12th, 2013, 08:34   #3
Stealth
Mr. Silencer
 
Join Date: Dec 2001
Location: Toronto
My advice, if you want it to last long at that velocity...
Lonex A1 motor
11.1v lipo battery (could get away with a 15C discharge rate)
M140/M150 spring
Upgraded cylinder head with 70oo sorbo buddies installed
Lonex Red piston
Upgraded metal nozzle with o-ring

Buy the above here: http://www.airsoftstore.ca

Also from my experience, the Systema "reinforced" gearboxes aren't terribly strong, so radius the cylinder windows for increased durability.
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