FYI, I'm using both a Guarder 150% spring set and an Action 160% spring set (two 1911s) intended for the Marui 1911. In an older 1911 I used the hammer spring, but in my newer MEU, I found the stock hammer spring (redesigned, longer and stiffer) to be better suited than the "upgraded" ones.
The Action 160% is actually shorter than the stock spring, but quite stiff, and I'm quite pleased with its performance.
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