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ProMag bodies seem to be pretty well-made.
However, I think that, eventually, the springs should be replaced with Wolff springs.
If you compare the lengths of ProMag and factory springs, you will be surprised by how short the ProMag springs are.
Skorzeny
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For to win one hundred victories in one hundred battles is not the acme of skill. To subdue the enemy without fighting is the supreme excellence. Sun Tzu
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