m&p recoil spring

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I put the fixed end in a soft-jaw vice and unscrewed the bolt on the guide rod with a miniature socket and ratchet. Control the spring when the bolt unscrews so you don't get a facefull.
Brownells has the ISMI flat-wound springs (in various weights) specifically for the M&P, that are far superior to the piano-wire aftermarkets.
 
I put the fixed end in a soft-jaw vice and unscrewed the bolt on the guide rod with a miniature socket and ratchet. Control the spring when the bolt unscrews so you don't get a facefull.

this is the best method I've found.
 
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