140%

  1. 123haby
    Thread

    M4 Stock spring upgrade to PDI 140% spring?

    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...
    Thread by: 123haby, Jul 26, 2009, 3 replies, in forum: Gun Building, Modifications & Repairs
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