• Reduce your factory 6.75lb Trigger Pull to a modified 3.75lb Trigger Pull!
  • 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.

    No Hassle 100% Lifetime Guarantee on Parts & Accessories:

    The Smith and Wesson M&P Trigger Spring Kit is protected by the M*CARBO No Hassle 100% Lifetime Guarantee. This means that at any time you can send it back and we will exchange it, issue a refund or assist you in any way possible. We even pay return shipping and automate the return process here!

    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 8 Reviews:
    North carolina

    M&P Shied spring kit

    Spring kit installed easily with no issues at all. tested trigger pull before at 6 lbs then tested after with a trigger pull of 4.5 lbs. That's perfect and exactly what i was looking for. wasn't looking for
    a very light trigger pull being it's one of my carrie weapons.
    can't best it for the price!

    Being a Veteran and an enthusiast of various weaponry, I was excited to learn Mcarbo had parts to fit my pistol. Along with extremely fast shipping, quality parts, and helpful conversation I was able to reduce the trigger pull to the weight I wanted to. Since the updated work the pistol shoots smooth and right on target. Thanks guys.


    Should have installed it sooner

    This kit really made a difference. Now I have to relearn how to shoot this pistol.

    Lincolnwood, Il

    Great product. Great service.

    I bought a 40cal. Shield online not knowing that it came with a #10 trigger pull. Rather than going through the hassle of dealing with the seller and shipping return I instead the spring kit.
    I now have a trigger that breaks at #5 1/4. It’s not the #2 1/2 as advertised but I didn’t do as much sanding & polishing. I’m totally satisfied with the trigger pull because it matches my other 2 Shields.

    Killeen TX

    Exactly what I needed

    This kit made my pistol feel like a completely different gun. Smooth as glass trigger take up. Nice crisp break. Wonderful trigger pull weight. Very happy with this kit. I did get the flitz polish kit to assist with the finishing work. Only difference between the video was the sear plunger spring didn't have a nipple to slide on so I did fight that to get my sight back on. Now to get the trigger put back together I faught and faught using the special tool. I would get the spring almost on the pin and then the dowel would slide out and the spring would slip off. I needed an extra hand. I had to use a punch to keep the tool pressed against the pin. When I got mid way I used a pick to get the spring on pin while keeping pressure between the punch and the pin. When I finally got it on I felt relieved and triumphant. I did have a shipping issue which made me depressed. It took about 2 weeks for my order to arrive. The second time they shipped my order I got it within a couple days. But hey it happens. Wish I lived near this shop to avoid the hassle of the USPS. All in all I'm glad my veteran brothers have products like this. Two thumbs up. My 16 year old son even was impressed.