M&P trigger pull test

[alphabrace]

Hello,
I ran a pull test on my M&P's and here are the results: 9mm FS average trigger pull was 8.5 lbs; 9mm compact, 10.8 lbs; 40cal FS, 9.35 lbs. One difference to note is the 9mm FS has about 1500 rounds down the tube while the others are NIB. The trigger does get better with use as the 9 to 40 data would support. I am going to do some trigger work to get the pull down further. I still tend to "jerk" a little when I dry fire practice. I don't know if it is me or the geometry of the trigger? I tried also to measure the length of pull but I could not come up with an accurate way to measure it. Just FYI....

 

[DrMark]

Wow, those seem stiff.

After about 500 rounds, I measured my FS M&P9's trigger pull at 6 lb, 6 oz.

With 1500+ rounds, I should measure it again.

Seen the Apex sears?
http://smith-wessonforum.com/smith-...112969-new-m-p-parts-available-soon-apex.html

Looked at this?
http://www.burwellgunsmithing.com/misc/M&Ptriggerjob.pdf

Good luck!

 

[hberttmank]

Those seem very high. Measured with a Lyman electronic scale mine are
M&P9 6lbs.
M&P9 Pro 4lbs.

 

[alphabrace]

Very interesting, I may need to run the test again. I have a calibrated force gauge I was using that has a hook on the end. I strung a cord through the trigger housing and tied it off creating a loop. One end of the loop against the trigger and opposite end of loop over the hook. The cord was draging along the frame but I was hoping that the friction was "in the weeds". I need to construct a "L" shaped wire that I can attached to the end of the force gauge. Thanks for your replys.

 

[Jimtl]

I have 3000+ rounds through my M&P9c and the trigger measures right at 5 lbs. It's stock ... just broken in. Much smoother than when new.

 

[Wee Hooker]

Wonder if your M&P compact/40 FS are MA compliant versions. Those come with a 10# pull be design. You can buy a $3 trigger return spring at brownells to bring it down to 7# though.

 

[Fastbolt]

Measuring trigger pull weight accurately is probably as much art as it is using the proper equipment.

While I have the old-style weights which came in my S&W revolver armorer tool kit, I pretty much only use that method for revolvers and 1911's. I use a battery powered digital gauge for the DA/DAO pistols and have it display averages from several trigger strokes. Placement of the hook and angle of pressure is important. If you're using something jury-rigged to check triggers don't be surprised if your results don't match factory figures.

The factory specifications for the standard 9/40/357 M&P's call for a 6 1/2 lb trigger pull with a +/- 2 lbs tolerance range. The .45 models run about a pound heavier, as I recall, at approx 7 1/2 +/- 2 lbs.

When my M&P 45 was NIB I checked it several times and received averages as low as 8 1/2 lbs and as high as a little over 9 lbs. I recently checked it again after it's been used to fire something like 3,000+ rounds (and received a new striker assembly, including a new striker spring), and the averaged weight was just barely 6 lbs. Nothing has been done to 'enhance' or reduce the trigger pull. Stock factory parts are in the gun.

I'm satisfied and comfortable with the trigger in my M&P 45 (and my M&P 40c, which I haven't checked but which feels lighter). Although I've had more than my fair share of opportunity to handle and shoot 1911's set up for target use, equipped with carefully set light triggers, I prefer a trigger weight of approx 5 - 5 1/2 lbs on a 'working' 1911. That's just me. (FWIW, the Colt armorer manual I have lists the recommended minimum weight as 4 1/2 lbs and the maximum weight as 7 1/2 lbs for the Model O Pistol.)

 

[alphabrace]

Complient?

Thanks for the responses! The M&P40 I bought came with 10 round mags which may be a complient model. Can I tell from the serial number?

 

[Wee Hooker]

Thanks for the responses! The M&P40 I bought came with 10 round mags which may be a compliant model. Can I tell from the serial number?

Yea, we are limited to 10 rounds here in MA . that throws a flag. Not sure if S&W could tell you based on serial # but it might be worth a call. ( They Are closed till teh 4th BTW)
That said, if you field strip it and either measure the diameter of/post a pic of the trigger return spring, we might be able to tell by comparing it to pics of 48 state guns. The spring is physically fatter. Again, it's a $3, 15 min simple fix if it is.

 

[presspics]

If your M&P box still have the decal on it then you can tell by the catalog number on the decal.

 

[TOF]

Mine all ran 6 to 6 1/2 pounds prior to polishing. They are now 4 to 4 1/2 pounds and smooth. 9, 40 & 45

 

[alphabrace]

Kalifornia comp

If your M&P box still have the decal on it then you can tell by the catalog number on the decal.

Well looks like I have the Kal. comp. model. Looks like I have to take the pin out that the trigger is hinged on to remove the return spring.

 

[Wee Hooker]

Well looks like I have the Kal. comp. model. Looks like I have to take the pin out that the trigger is hinged on to remove the return spring.

Hint: Just drive the pin 1/2 way out ( to left) so everything stays lined up. i.e. Just far enough so that the spring end slips off. Then swap to the lighter spring on teh trigger bar end. Now Jam the tip of a exacto knife between the coils of the new spring. This lengthens the spring just enough to guide it (with the knife) back into the pin slot. Then just push the pin (with thumb) to close everything up. You should immediatly feel the difference.
hth

 

[alphabrace]

Thanks Wee, I'm going to give it a try tomorrow while I'm watching some meaningless football games like the colts who thru away the game last week and thus are no longer undefeated!

 

[rickflst]

Yea, we are limited to 10 rounds here in MA . that throws a flag. Not sure if S&W could tell you based on serial # but it might be worth a call. ( They Are closed till teh 4th BTW)
That said, if you field strip it and either measure the diameter of/post a pic of the trigger return spring, we might be able to tell by comparing it to pics of 48 state guns. The spring is physically fatter. Again, it's a $3, 15 min simple fix if it is.

Just recently bought my 40c. Of course a MA trigger 10# pull at least. Does the standard spring (non-MA) really help the trigger that much? I was thinking of dealing with this trigger until I got used of it but it is quite the pull.

 

[JL Murray]

My M&P 9 is right at 6lb

 

[SaintsDad]

My M&P9 FS has about 2800 rounds through it and measures about 5 lbs. My Shield 9 has about 700 rounds and still measures upwards of 9 lbs. Horrible. I'm seriously considering the S&W Action Package since this will be my EDC.

 

[oldmustang]

My M&P9 FS has about 2800 rounds through it and measures about 5 lbs. My Shield 9 has about 700 rounds and still measures upwards of 9 lbs. Horrible. I'm seriously considering the S&W Action Package since this will be my EDC.

I just replaced the trigger return spring on my Ma compliant Shield (bought in Texas where I live) with a lower 48 trigger return spring. What a noticeable difference, much lower in pull weight. The Ma compliant spring was purple in color while the lower 48 one was natural metal in color. It is S&W part # 391420000. Brownels ($2.99) and Midway sell them as well as S&W, it is the same spring for M&Ps, Sigmas and Shields. Used the You Tube video to swap springs. Took me maybe 15 minutes. Try it, you will feel the difference.

 

[Bkreutz]

Apex forward set sear with flat faced trigger on a FS9, polished pins.

 

[boomerguy49]

I don't have a way to measure the exact trigger pull on my M&P 9c but after it broke in, the stock trigger felt like it had reduced by about 1 pound. The pistol is the newer model and has always had the smooth travel and crisp break and crisp reset. I was already happy with it but I went ahead and replaced the stock sear with the APEX standard fully machined sear and the pull is about an additional pound lower. The travel is still smooth with a crisp break and crisp reset, but the break is about 1 or 2 mm farther back. The pull is significantly lower than my Glock Gen3 with a 3.5 pound connector spring which is pretty low. I am extremely happy with the M&P trigger.