400 FPS is over most feild limits here, plus, thats really far more FPS then you need.
to keeep it running well?
shims, lube, and a softer spring.
but Comanche has it right, is nothings wrong with it, and you don't know what your doing, don't open it
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Quote:
It's better to light a candle, than to curse the darkness
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Chinese proverb
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