M4 Stock spring upgrade to PDI 140% spring?

Discussion in 'Gun Building, Modifications & Repairs' started by 123haby, Jul 26, 2009.

  1. 123haby

    123haby New Member

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    I would like to know if I upgrade my M4's stock spring to a DPI 140% spring, would I have to change any other internals like new bushing or a new shims?

    thanks ;)

    123haby
     
  2. Krazyboy87

    Krazyboy87 New Member

    2,603
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    just make one thread for both questions. there is no need for 2 seperate threads.
     

  3. Bullpupguy

    Bullpupguy New Member

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    denver
    What is the make and model?
     
    Last edited: Jun 1, 2013
  4. NeoAugAU-3G

    NeoAugAU-3G Active Member

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    Las Vegas
    need more info. what m4? what motor? have you done anything else such as shim aoe or replace other parts in the past? chances are if everything is stock your motor will have trouble pulling a 140. depending on brand of m4 it may be as little as a new motor, shimming, and correcting aoe.