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Get a different kit if you must upgrade that much, the spring alone is a 500fps one and will kill any mechbox you put it in. Get one with a 110 spring in it if yo uinsist on a full upgrade kit. I installed the same kit a few weeks back (different spring) and the owner is bringing it back to me to install another kit because he didn't like the noise or the slow trigger response/ low rate of fire.
Why not just get bushings, spring and spring guide upgrades? You don't need to spend $300 to have a reliable AEG (often the opposite is true).
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