• Reduce your factory 6.75lb Trigger Pull to a modified 3.75lb Trigger Pull! (Average results can vary up to +/- 1lb)
  • Ultimate Smith and Wesson M&P Trigger Upgrade!
  • Improve Smith and Wesson M&P Pistol accuracy and overall performance
  • 50% Trigger Pull Reduction!
  • Functions in S&W M&P Models chambered in 9mm / .357 / .40 cal & .45ACP
  • Works for S&W M&P 1.0 & 2.0
  • Best Aftermarket Trigger for Smith and Wesson M&P Pistols!
  • Highest Quality American Spring Steel ASTM A228 Music Wire
  • Kit also includes Assembly Dowel
  • Protected by the M*CARBO 100% Lifetime Guarantee
  • Made in the USA!
  • Fast Same Day Shipping!

Smith and Wesson M&P Trigger Upgrade Kit 1.0 & 2.0 - 9mm | .357 | .40 cal | .45 ACP

  • Custom Lighter Striker Spring
  • Custom Lighter Striker Block Spring
  • Custom Lighter Sear Spring
  • Custom Heavy Duty Trigger Return Spring ( Extra power reduces the felt trigger pull weight)
  • Includes Trigger Spring Installation Tool
  • 1,000 Grit Silicon Carbide Sandpaper
  • Synthetic Grease with PTFE

Reduce your Smith and Wesson M&P Trigger Pull from a stock 6.75lbs to a modified 3.75lbs!  50% Trigger Pull Reduction!

Best Custom Smith and Wesson M&P Trigger Upgrade for a lighter and smoother trigger pull.  Reduce your Smith and Wesson M&P Trigger Pull by 50%.  M*CARBO specializes in Smith and Wesson M&P 9mm Aftermarket Parts for Superior Performance!

Smith and Wesson M&P 9mm Trigger Kit & 40 Trigger Kit will improve accuracy and tighten up shot groups!  Works for the following calibers 9mm / .357 / .40 cal & .45ACP.  Also works for the S&W M&P 1.0 & 2.0!

Hands down Best Smith and Wesson M&P Trigger Available and Only One Made by Combat Veterans! Take your Smith and Wesson M&P to the Next Level of Competition Performance!  

The Best Smith and Wesson M&P 40 Upgrades for a Smoother Trigger Pull. Compatible Lighter Trigger Pull with Custom Smith and Wesson M&P 9mm Upgrades for the Factory M&P Trigger.

Smith and Wesson M&P Owners Manual:

If your getting the Smith and Wesson M&P Trigger Spring Kit, then you might find the following Smith and Wesson M&P Resources useful in further enhancing your firearm for other Smith and Wesson M&P Accessories. Download the Smith and Wesson M&P Owners Manual.

    M*CARBO No Hassle 100% Lifetime Guarantee:

    The Smith and Wesson M&P Trigger Spring Kit is protected by the M*CARBO No Hassle 100% Lifetime Guarantee.

    Drop Tested and Approved:
    Smith and Wesson M&P Trigger Spring Kit includes M*CARBO ASTM Spec Springs that will offer a perfect trigger pull reduction with an unlimited drop test rating (3", 6", 9" & 12"+).

    Range Tested and Approved:

    The Smith and Wesson M&P Trigger Spring Kit has been tested repeatedly with numerous brands of ammunition to ensure reliable operation and safety.

    Veteran Owned and Operated Business:

    American made Smith and Wesson M&P Trigger Spring Kit designed and manufactured by Combat Veterans. We will donate a portion of your purchase to the Military Foundations we humbly support.


    You must be 18 yrs of age to purchase. We advise that all parts purchased from our inventory be installed and inspected by a qualified gunsmith. Modifying your weapon may be prohibited in your state. Do not modify your sear or hammer engagement surfaces, with or without the Smith and Wesson M&P Trigger Spring Kit. Before installing please be sure to check all local state and federal laws. By installing this part you agree to take full responsibility for any and all legal, health and warranty consequences that may be incurred.

    Overall Customer Rating of 49 Reviews:

    S&W, MP .45

    The M&P is a whole new animal after the spring upgrade! Well worth the time and effort to polish and install. Simply Amazing results!

    St. Louis mo

    Worth the money!

    I can’t say how it compares to the apex setup. But, for the price you can not beat it. I also put a Hyve monarch trigger on it. The difference is night and day. Almost no take up and the trigger reset is a positive click. I also did the polishing inside to smooth out the trigger pull. The bench block works and I can’t really complain about it considering how cheap it was to buy. The springs and polishing took me a total of 2 hrs. I was in no rush to get it done so I took my time watching tv while polishing. Thanks for the extremely affordable price and amazing trigger set.

    Very great products

    I ordered the kit for my shield 9mm. And I received the product within 3 days. The company reached out to me multiple times to let me know when it would arrive and to see if I had any issues. The instructional video is a must. I had some issues with the rear sight at first, but once that was removed it was a very relaxing process. I just followed along with the video and man did it make a big difference in my trigger pull and made it so much smoother also

    Seminole, FL

    Excellent Product

    I went online on a Sunday afternoon and placed an order with M*CARBO for some components for one of my M&P pistols. On Monday morning around 9:30 to check my emails and there was an email informing me that the items I ordered had shipped. Wow! I received them two days later and was anxious to open and inspect them. Quality was superb. Can’t wait to start my trigger project. Chris and his team are professionals providing a quality product at a reasonable price. I plan on ordering other items in the future. Another thing, the video on the M&P pistol is easy to follow plus it is one of the few how-to videos that tells you upfront all the tools and items you need to do the mission.


    I purchased a new M&P 9mm that was Ma. compliant. It was the only one I could find in my area. The stock trigger was probably the worst I have ever had. This kit from Mcarbo was fairly easy to install.
    After polishing and spring installation the trigger was better, but not good. I don't own a trigger pull gage so I can't say for sure what the pull weight was. I do own another M&P 9mm with the stock trigger pull and the new one was still quite a bit more difficult after this kit was installed.

    While inspecting the differences between the two trigger sets, I noticed the sears were different. I found that the sear in the older pistol was actually S&W's competition sear. I purchased a competition sear online for $8 plus shipping. After installing the new sear the triggers feel almost identical.
    I am assuming they are both around 6# now.

    Overall, I am happy with the kit from Mcarbo. Just note that you may need to go a little further if you got stuck with one of the Ma. compliant triggers.

    Number of questions: 0