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UTG 870 Shotgun 450FPS

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  • #1

    UTG 870 Shotgun 450FPS

    Hey,
    I have a 870 short shotgun but it fires well over 400 fps.
    i would like to downgrade the spring to 320 ish (with .25)

    has anyone done this before?
    does anyone know what spring might fit?
    does a shop do any better quality spares for it?

    Thanks wise people.
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