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  • AR-15 Trigger Spring Kit M*CARBO
  • AR-15 Hammer with Lighter Hammer Spring
  • AR-15 Trigger with Lighter Trigger Spring
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AR-15 Trigger Spring Kit

review-star review-star review-star review-star review-star
(4.88) 272 reviews
Price: $14.95
in-stock-product Availability: IN STOCK

Retail: Retail: $17.95

You Save: $3.00 (16.7%)


Quantity:
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Product Information

About This Item

  • The M*CARBO AR-15 Trigger Spring Kit is designed to reduce your trigger pull from a stock ~6lbs to a modified ~4.5lbs  (Average results can vary up to +/- 1lb)
  • Enhances accuracy and tightens shot groups.
  • Features a 15% lighter custom hammer spring and a 40% lighter custom trigger spring for optimal performance.
  • Recognized as one of the best AR-15 trigger upgrade kits available.
  • Ensures proper functionality with all brands of civilian ammunition as well as military green tip 5.56 ammo.
  • Manufactured from the highest quality American Spring Steel, ASTM A228 Music Wire, guaranteeing durability.
  • Protected by the M*CARBO 100% Lifetime Guarantee
  • Made in the USA!
  • Fast Same Day Shipping!

WHAT'S IN THE KIT:

  • 1 - Custom Lighter Hammer Spring
  • 1 - Custom Lighter Trigger Spring

*Note: The installation video currently only covers the hammer spring installation. A new video is in the works and will be available soon.

Description

AR-15 Trigger Spring Kit

Upgrade the performance of your AR-15 with our AR-15 Trigger Spring Kit - the best AR 15 trigger upgrade kit on the market.

Made from the highest quality American Spring Steel ASTM A228 Music Wire, this kit will reduce your trigger pull weight from a stock ~6lbs to a modified weight of ~4.5lbs (average results can vary up to +/- 1lb), providing improved accuracy and tighter shot groups.

This kit includes a 15% lighter custom hammer spring and a 40% lighter custom trigger spring, designed to improve your trigger pull weight without compromising the reliability of your firearm. The AR-15 Trigger Spring Kit will properly function with all brands of Civilian ammo as well as Military green tip 5.56 ammo, making it a versatile and reliable choice for any shooter.

This kit ensures reduced malfunctions and consistent performance. With the M*CARBO AR-15 Trigger Kit, you can expect an excellent AR 15 trigger pull weight reduction, which will significantly improve your shooting experience.

AR-15 Resources:

Use the following AR-15 Resources to further enhance your firearm. Download the Official Army Training Manual. Use the different Exploded Views of the AR-15 Parts Diagram to plan your next firearm project. Print or Download any of the AR-15 Resources.

AR-15 Owner's Manual
AR-15 Exploded View
AR-15 Trigger Group Exploded View

M*CARBO No Hassle 100% Lifetime Guarantee:

The AR-15 Trigger Spring Kit is protected by the M*CARBO No Hassle 100% Lifetime Guarantee.

Drop Tested and Approved:

AR-15 Trigger Spring Kit is drop Tested according to SAAMI Standard Z299.5 rating (12" & 48").

Tested and Approved:

The AR-15 Trigger Spring Kit has been tested repeatedly to ensure reliable operation and safety.

Veteran Owned and Operated Business:

American made AR-15 Trigger Spring Kit is designed and manufactured by Combat Veterans. We will donate a portion of your purchase to the Military Foundations we humbly support.

ATTENTION:

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 AR-15 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.

Reviews
Great kit
review-star review-star review-star review-star review-star
This kit is advertised as a trigger spring kit and comes with both trigger and hammer spring. I’m new to the AR platform but found this easy to install. Currently the mcarbo site only has a video for the hammer spring but there’s a lot of trigger spring videos out there. Great upgrade for the money
Ar15 trigger kit
review-star review-star review-star review-star review-star
Did as expected. For the price it’s great.
On my it was about 4.5lbs. Definitely an improvement. I like 3lbs triggers but for this build it didn’t matter. And for that reason this kit was perfect.
review-star review-star review-star review-star review-star
I added the trigger spring kit and a new flat face trigger shoe on my AR's trigger assembly. I also polished the usual spots on my trigger assembly. The difference is night and day in my trigger pull. I have no more gritty feel and the pull and reset stroke is great. I recommend this product to anyone looking to reduce the pull weight on their trigger.
review image  
Works great
review-star review-star review-star review-star review-star
Lowered trigger pull weight a solid 2 lbs each on our 2 AR's . Easy to install. Happy with product. Very fair price. Shipping is fast.
The mcarbo AR-15 Trigger Spring Kit works!!
review-star review-star review-star review-star review-star
I have the mcarbo trigger spring kit in all my full size ARs and AR pistols.

This is my latest AR pistol, factory spring reading of 7 pounds 1.8 oz, then 4 pounds, 4.9 oz after the mcarbo trigger spring kit was installed.

The pictures speak for themselves.

review image   review image  
Light Strikes
review-star review-star review-star review-star review-star
I have purchased 3 spring kits. One for a Savage 62, and Two for AR-15's. Rating the Savage, it is hands down a 5 star rating. Nice clean trigger break, and much lighter trigger pull. Well worth the investment. Now for the AR's. I wish I had the same report, but I do not. I will be putting the original hammer spring back. I am running near a 20% failure to fire rate since I started using the M*Carbo spring. The following primers have fail to work: 1) factory loads from PMC and Winchester. 2) CCI 400 primers, and Winchester small mag rifle #41. I have to give these sets a one star rating. An 1 in 6 fail rate is not acceptable.
2 lb recuction.
review-star review-star review-star review-star review-star
The spring kit dropped my PSA lower's trigger from 7lbs to a 5lb pull. Easy to install. Very happy.
Trigger and hammer springs
review-star review-star review-star review-star review-star
Very easy installation and right off the bat I could my trigger was lighter with out even measuring my trigger pull. I went to the rang and used different variety of ammo and it held up like a champ
Questions & Answers
0 0
Question:
Will this work on a LR308
January 29, 2024 9:21 AM
0 0
Question:
Will this kit work with 6.5 Creedmoor Ammunition Primers?
April 20, 2023 8:22 AM
Answers
Yes it will function properly on 6.5 Creedmoor Ammunition Primers
Answered by
M*CARBO-Tech / April 20, 2023 8:34 AM
0 0
Question:
Hi, does this would fit in my kodiak defence wk180c gen2?
August 31, 2022 12:16 AM
Answers
This part will function in any mil spec trigger group.
Answered by
stevenk@mcarbo.com24442 / November 18, 2022 8:20 AM
0 0
Question:
Will this spring kit work in my DB9R
Larry16SK2S31 April 7, 2022 3:51 PM
Answers
Yes the Fire Control Group is the standard AR15 Trigger Group in the DB9R, so this spring will fit and function properly! :)
Answered by
Abby Marino / April 18, 2022 11:05 AM
0 0
Question:
will this work in an ar15. 7.62x39 with steel cased ammo...known for light primer strikes.?
matt p February 28, 2022 4:00 PM
Answers
As long as you have a standard AR15 Fire Control Group the spring will fit and will work properly, but it will not resolve an already-prevalent light primer strike issue. We do extensive testing with our springs with MIL-SPEC brass casings but cannot recommend steel-cased ammo for regular shooting unless it's a last resort, due to the wear and damage it can cause to your barrel over time.
Answered by
Abby Marino / April 18, 2022 7:40 AM
0 0
Question:
Will this Kit work on M&P AR15-22?
February 28, 2022 11:03 AM
Answers
Yes it will since the lower receiver of the 22 caliber M&P Rifle measures to the same functional specs of the 5.56mm AR-15 lower receiver. The MCARBO Spring kit has also been tested in the M&P15-22 Rifle to ensure reliable and safe operation.
Answered by
Abby Marino / April 18, 2022 7:43 AM
0 0
Question:
I have an AR 15 lower with a 450 bushmaster lower, will this spring work? Thank you.
January 6, 2022 7:15 PM
Answers
As long as it is a standard AR15 Fire Control Group this spring will work!
Answered by
Abby Marino / April 18, 2022 7:28 AM
0 0
Question:
Will this work on a Db Ar10
Bmaverick January 4, 2022 2:48 PM
Answers
Yes! The Diamondback AR10 still has the same hammer set-up, which means our Hammer Spring is compatible
Answered by
Abby Marino / January 5, 2022 2:14 PM
0 0
Question:
will it work on Ar 15 pistol ?
Sal Hamdalla December 18, 2021 6:55 PM
Answers
Yes as long is a normal AR-15 hammer will work on your firearm
Answered by
waldo@mcarbo.com37647 / December 20, 2021 9:53 AM
Yes as long is a normal AR-15 hammer will work on your firearm
Answered by
waldo@mcarbo.com37647 / December 20, 2021 9:52 AM
Yes as long is a normal AR-15 hammer will work on your firearm
Answered by
waldo@mcarbo.com37647 / December 20, 2021 9:52 AM
Yes as long is a normal AR-15 hammer will work on your firearm
Answered by
waldo@mcarbo.com37647 / December 20, 2021 9:52 AM

About This Item

  • The M*CARBO AR-15 Trigger Spring Kit is designed to reduce your trigger pull from a stock ~6lbs to a modified ~4.5lbs  (Average results can vary up to +/- 1lb)
  • Enhances accuracy and tightens shot groups.
  • Features a 15% lighter custom hammer spring and a 40% lighter custom trigger spring for optimal performance.
  • Recognized as one of the best AR-15 trigger upgrade kits available.
  • Ensures proper functionality with all brands of civilian ammunition as well as military green tip 5.56 ammo.
  • Manufactured from the highest quality American Spring Steel, ASTM A228 Music Wire, guaranteeing durability.
  • Protected by the M*CARBO 100% Lifetime Guarantee
  • Made in the USA!
  • Fast Same Day Shipping!

WHAT'S IN THE KIT:

  • 1 - Custom Lighter Hammer Spring
  • 1 - Custom Lighter Trigger Spring

*Note: The installation video currently only covers the hammer spring installation. A new video is in the works and will be available soon.

AR-15 Trigger Spring Kit

Upgrade the performance of your AR-15 with our AR-15 Trigger Spring Kit - the best AR 15 trigger upgrade kit on the market.

Made from the highest quality American Spring Steel ASTM A228 Music Wire, this kit will reduce your trigger pull weight from a stock ~6lbs to a modified weight of ~4.5lbs (average results can vary up to +/- 1lb), providing improved accuracy and tighter shot groups.

This kit includes a 15% lighter custom hammer spring and a 40% lighter custom trigger spring, designed to improve your trigger pull weight without compromising the reliability of your firearm. The AR-15 Trigger Spring Kit will properly function with all brands of Civilian ammo as well as Military green tip 5.56 ammo, making it a versatile and reliable choice for any shooter.

This kit ensures reduced malfunctions and consistent performance. With the M*CARBO AR-15 Trigger Kit, you can expect an excellent AR 15 trigger pull weight reduction, which will significantly improve your shooting experience.

AR-15 Resources:

Use the following AR-15 Resources to further enhance your firearm. Download the Official Army Training Manual. Use the different Exploded Views of the AR-15 Parts Diagram to plan your next firearm project. Print or Download any of the AR-15 Resources.

AR-15 Owner's Manual
AR-15 Exploded View
AR-15 Trigger Group Exploded View

M*CARBO No Hassle 100% Lifetime Guarantee:

The AR-15 Trigger Spring Kit is protected by the M*CARBO No Hassle 100% Lifetime Guarantee.

Drop Tested and Approved:

AR-15 Trigger Spring Kit is drop Tested according to SAAMI Standard Z299.5 rating (12" & 48").

Tested and Approved:

The AR-15 Trigger Spring Kit has been tested repeatedly to ensure reliable operation and safety.

Veteran Owned and Operated Business:

American made AR-15 Trigger Spring Kit is designed and manufactured by Combat Veterans. We will donate a portion of your purchase to the Military Foundations we humbly support.

ATTENTION:

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 AR-15 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.

Product Reviews (272)
review-star review-star review-star review-star review-star
4.88
Great kit
review-star review-star review-star review-star review-star
This kit is advertised as a trigger spring kit and comes with both trigger and hammer spring. I’m new to the AR platform but found this easy to install. Currently the mcarbo site only has a video for the hammer spring but there’s a lot of trigger spring videos out there. Great upgrade for the money
Ar15 trigger kit
review-star review-star review-star review-star review-star
Did as expected. For the price it’s great.
On my it was about 4.5lbs. Definitely an improvement. I like 3lbs triggers but for this build it didn’t matter. And for that reason this kit was perfect.
review-star review-star review-star review-star review-star
I added the trigger spring kit and a new flat face trigger shoe on my AR's trigger assembly. I also polished the usual spots on my trigger assembly. The difference is night and day in my trigger pull. I have no more gritty feel and the pull and reset stroke is great. I recommend this product to anyone looking to reduce the pull weight on their trigger.
review image  
Works great
review-star review-star review-star review-star review-star
Lowered trigger pull weight a solid 2 lbs each on our 2 AR's . Easy to install. Happy with product. Very fair price. Shipping is fast.
The mcarbo AR-15 Trigger Spring Kit works!!
review-star review-star review-star review-star review-star
I have the mcarbo trigger spring kit in all my full size ARs and AR pistols.

This is my latest AR pistol, factory spring reading of 7 pounds 1.8 oz, then 4 pounds, 4.9 oz after the mcarbo trigger spring kit was installed.

The pictures speak for themselves.

review image   review image  
Light Strikes
review-star review-star review-star review-star review-star
I have purchased 3 spring kits. One for a Savage 62, and Two for AR-15's. Rating the Savage, it is hands down a 5 star rating. Nice clean trigger break, and much lighter trigger pull. Well worth the investment. Now for the AR's. I wish I had the same report, but I do not. I will be putting the original hammer spring back. I am running near a 20% failure to fire rate since I started using the M*Carbo spring. The following primers have fail to work: 1) factory loads from PMC and Winchester. 2) CCI 400 primers, and Winchester small mag rifle #41. I have to give these sets a one star rating. An 1 in 6 fail rate is not acceptable.
2 lb recuction.
review-star review-star review-star review-star review-star
The spring kit dropped my PSA lower's trigger from 7lbs to a 5lb pull. Easy to install. Very happy.
Trigger and hammer springs
review-star review-star review-star review-star review-star
Very easy installation and right off the bat I could my trigger was lighter with out even measuring my trigger pull. I went to the rang and used different variety of ammo and it held up like a champ

Questions & Answers

9 Questions

0 0
Question:
Will this work on a LR308
January 29, 2024 9:21 AM
0 0
Question:
Will this kit work with 6.5 Creedmoor Ammunition Primers?
April 20, 2023 8:22 AM
Answers
0 0
Yes it will function properly on 6.5 Creedmoor Ammunition Primers
Answered by
M*CARBO-Tech / April 20, 2023 8:34 AM
0 0
Question:
Hi, does this would fit in my kodiak defence wk180c gen2?
August 31, 2022 12:16 AM
Answers
0 0
This part will function in any mil spec trigger group.
Answered by
stevenk@mcarbo.com24442 / November 18, 2022 8:20 AM
0 0
Question:
Will this spring kit work in my DB9R
Larry16SK2S31 April 7, 2022 3:51 PM
Answers
0 0
Yes the Fire Control Group is the standard AR15 Trigger Group in the DB9R, so this spring will fit and function properly! :)
Answered by
Abby Marino / April 18, 2022 11:05 AM
0 0
Question:
will this work in an ar15. 7.62x39 with steel cased ammo...known for light primer strikes.?
matt p February 28, 2022 4:00 PM
Answers
0 0
As long as you have a standard AR15 Fire Control Group the spring will fit and will work properly, but it will not resolve an already-prevalent light primer strike issue. We do extensive testing with our springs with MIL-SPEC brass casings but cannot recommend steel-cased ammo for regular shooting unless it's a last resort, due to the wear and damage it can cause to your barrel over time.
Answered by
Abby Marino / April 18, 2022 7:40 AM
0 0
Question:
Will this Kit work on M&P AR15-22?
February 28, 2022 11:03 AM
Answers
0 0
Yes it will since the lower receiver of the 22 caliber M&P Rifle measures to the same functional specs of the 5.56mm AR-15 lower receiver. The MCARBO Spring kit has also been tested in the M&P15-22 Rifle to ensure reliable and safe operation.
Answered by
Abby Marino / April 18, 2022 7:43 AM
0 0
Question:
I have an AR 15 lower with a 450 bushmaster lower, will this spring work? Thank you.
January 6, 2022 7:15 PM
Answers
0 0
As long as it is a standard AR15 Fire Control Group this spring will work!
Answered by
Abby Marino / April 18, 2022 7:28 AM
0 0
Question:
Will this work on a Db Ar10
Bmaverick January 4, 2022 2:48 PM
Answers
0 0
Yes! The Diamondback AR10 still has the same hammer set-up, which means our Hammer Spring is compatible
Answered by
Abby Marino / January 5, 2022 2:14 PM
0 0
Question:
will it work on Ar 15 pistol ?
Sal Hamdalla December 18, 2021 6:55 PM
Answers
0 0
Yes as long is a normal AR-15 hammer will work on your firearm
Answered by
waldo@mcarbo.com37647 / December 20, 2021 9:53 AM
0 0
Yes as long is a normal AR-15 hammer will work on your firearm
Answered by
waldo@mcarbo.com37647 / December 20, 2021 9:52 AM
0 0
Yes as long is a normal AR-15 hammer will work on your firearm
Answered by
waldo@mcarbo.com37647 / December 20, 2021 9:52 AM
0 0
Yes as long is a normal AR-15 hammer will work on your firearm
Answered by
waldo@mcarbo.com37647 / December 20, 2021 9:52 AM

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