The main spring works hand in hand with the recoil spring and it is designed to balance the recoil force,so changing specs one way or the other would
require compensation from the other parts.To different extent all the springs
in the pistol work together and are designed for the .45 ACP pistol ball force.
The standard GI spring combination is tried, true and it works other weights
might also work this being a great tribute to the M1911's excellent design.
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