S&W M&P changes

[Tmcfarland]

How many out there have experimented with different weighted recoil springs in the M&P?

Recently I purchased a 5" Tungsten un-captured guide rod, a 17#, 15#, 13# and an 11# recoil spring to go in the 9L pro (non-ported) and the 9L PC CORE. Went to shoot those tonight and was a little let down that magic didn't happen...not really but was hoping to see some improvements for follow up shots. Here is what I did learn;

9L (non-ported)

11# spring too light

13# spring too light

15# spring worked real nice

17# (factory weight) felt the same but with less muzzle rise, more than likely to do with the extra weight of the tungsten guide rod (58 grams compared to the 25 grams of the factory)

Shock Buffer did nothing but mess up the timing and accuracy, probably due to the different stroke of the slide...I will try it again to make sure.

9L CORE (ported)

11# a little too light, felt like it was slamming the slide into the frame too hard.

13# worked good even with the lighter 125PF loads.

15# spring felt good too, worked better with the higher 135PF loads though.

The tungsten guide rod...really couldn't tell the difference but I will video soon and see if the difference can be seen in slow motion.

Thought this might help somebody thinking on changing stuff up.

[Vlad]

M&Ps don't need a lot of spring magic. Use a 15lb and a rod of your choice and shoot it.

[3gunjunky]

Any luck with the video yet?

[Tmcfarland]

not yet, been working the nightshift and it is near impossible to get to the range or do any practice.

[empire12369]

I've run 11 13 and 15 in mine and found that the 15 was the only one I could get to run reliably with CCI primers.

[Tmcfarland]

https://vimeo.com/138708520

i moved to the 40 cal so I could score major. After messing around with all the spings I ended up running a 15lb with the full tungsten guide rod. It ran good with no issues. Here are the results

Thanks