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Nothing is wrong with the standard springs. But when you start getting into odd barrel lengths or attaching sound suppressors you may need a little different spring. And then there are people in competitions who want minimum power loadings for low recoil and they need a lower power spring for reliable function. |
A little hotter, no. But if you are using an upper for something like .50 Beowulf or .458 SOCOM then an extra power spring helps. |
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