Zoomy Posted July 28, 2015 Share Posted July 28, 2015 My nephew has a M&P Prom 9mm for production and will not cycle reliably my 130 Power factor 124 grain loads that work fine in my wife's XDm 5.25. I purchased a 13 lb spring for my nephews M&P and found the guide rod had a bolt that held the spring captive. Took 1/4" socket and a pair of vice grips on the other end to remove the bolt. The bolt would not loosen and the other end just spun in the vice grips. I heated the bolt end in case locktite was used. Still no go. Anyone have any ideas. I wanted to buy a non captive aftermarket guide rod but it seems they are all tungsten. Link to comment Share on other sites More sharing options...
open17 Posted July 28, 2015 Share Posted July 28, 2015 My wife shoots a M&P Pro 9mm. I tried the various reduced power flat springs, and when I got down around 13 lbs the lockup was iffy. Ended up with a 14 lb round wire Wolff on a non-captive (and not tungsten) Wolff guiderod. It also functioned fine with a 12 lb Wolff, but the gun felt sluggish. Link to comment Share on other sites More sharing options...
wgj3 Posted July 28, 2015 Share Posted July 28, 2015 That nut WILL unscrew, but be careful to not damage the head of the rod with vgrips. Try compressing one end of spring on captured rod and gripping the rod in the gap you created. SSS has steel guide rods aplenty. And, likely you will end up with a 12-14# recoil spring. Lightening the striker spring will help with lockup when using lighter recoil springs. Link to comment Share on other sites More sharing options...
Zoomy Posted July 28, 2015 Author Share Posted July 28, 2015 Thanks. I'll pickup a guide rod and try the 13# spring first. Link to comment Share on other sites More sharing options...
zombywoof Posted October 20, 2015 Share Posted October 20, 2015 I have the SSS SS guide rod and 13 pound spring in my Pro. Runs great Link to comment Share on other sites More sharing options...
SterlingSomeone Posted October 22, 2015 Share Posted October 22, 2015 (edited) I have been running the SSS tungsten guide rod and love it.I run it in both my production and limited M&P's. The 13# ISMI spring works well but I prefer the 15. Edited October 22, 2015 by SterlingSomeone Link to comment Share on other sites More sharing options...
MacLethal Posted November 2, 2015 Share Posted November 2, 2015 What is the factory spring on a 4.25" gun? Link to comment Share on other sites More sharing options...
ttownracer Posted November 2, 2015 Share Posted November 2, 2015 SSS SS guide rod and 12 or 13 pound spring works great in both of my Pro's running 130 PF loads. Link to comment Share on other sites More sharing options...
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