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  • Labeled AR-15 Trigger Spring Kit - Hammer Spring
  • AR-15 Trigger Spring Kit M*CARBO
  • Packaged AR-15 Trigger Spring Kit M*CARBO
  • AR-15 Custom Lighter Hammer Spring M*CARBO
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AR-15 Trigger Spring Kit

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(4.88) 262 reviews
Price: $12.95
in-stock-product Availability: IN STOCK

Retail: $15.95

You Save: $3.00(18.8%)


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Product Information

About This Item

Description

AR-15 Trigger Spring Kit - What's Included:

  • Custom designed Lighter Hammer Spring.

The AR-15 Trigger Spring Kit will reduce your trigger pull from a factory weight of 6lbs to a modified weight of 4.5lbs. Your Trigger will properly function with all brands of Civilian ammo as well as Military green tip 5.56 ammo. This Kit is made of the highest quality spring steel available, right here in the USA. 

The AR-15 Trigger Spring Kit will improve your accuracy and tighten your shot groups. Reduced malfunctions should be expected because the trigger spring kit is constructed of the highest quality 302 stainless spring steel. The M*CARBO AR-15 Trigger Spring Kit was designed and tested to properly function with all brands of civilian and military grade ammunition. Expect an excellent AR 15 trigger pull weight reduction without compromising the reliability of your firearm.

                          

Q: Will this kit work for my AR-15 22 M&P Rifle?

A: 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.

Q: Will this kit work with 6.5 Creedmoor Ammunition Primers?

A: Yes it will function properly on 6.5 Creedmoor Ammunition Primers

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.

ARMY 5.56 MM Training Manual

AR-15 Exploded View

AR-15 Lower Exploded View

AR-15 Trigger Spring Kit Printable Instructions


Build your own AR-15 Lower

M*CARBO No Hassle 100% Lifetime Guarantee:

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

No Hassle 100% Lifetime Guarantee Ribbon

Drop Tested and Approved:

M*CARBO ASTM Spec Springs will offer a perfect trigger pull reduction with an unlimited drop test rating (3", 6", 9" & 12"+).

Drop Tested and Approved Icon

Range Tested and Approved:

The AR-15 Trigger Spring Kit has been tested with numerous brands of civilian and military grade ammunition to ensure reliable operation and safety.

Product Tested and Approved Sticker

Veteran Owned and Operated Business:

American-Made Upgrades designed and manufactured by Combat Veterans. We donate a portion of your purchase to the Military Foundations we humbly support.

Veteran Owned Business Ribbon


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
Doesn't work on Ruger AR556
review-star review-star review-star review-star review-star
Hate giving 1 star because it sounds like you're ticked off - I'm not. But I installed this in my Ruger AR556 and it made zero difference. The hammer spring has one less coil, so not sure why. Have already done the paracord break-in routine plus have over 2600 rounds through this gun, so the trigger should be well broken in. I don't know, seems like it should have worked. I'm open to suggestions, especially if you have a Ruger AR556 and it worked in your gun.
Ar 15 spring kit
review-star review-star review-star review-star review-star
Great little kit. Easy install. Can't ask for anything else. Thank you again.
Does the job!
review-star review-star review-star review-star review-star
I was looking for another option to improve my AR triggers besides the ALG purple spring. This fit the bill perfectly
great product
review-star review-star review-star review-star review-star
very happy easy to install trigger is so much better i have arthritis so it was hard for me now its perfect thanks keep up the great work.
review-star review-star review-star review-star review-star
Trigger pull is only a half pound different from factory. 7.5lbs factory, after installing spring, 7lbs...not happy with product. Waste of money and time.
Color me happy.
review-star review-star review-star review-star review-star
Notwithstanding the shipping time (5 days to go 90 miles, but that's the fault of USPS), color me happy. Installation was just as easy as the video indicated. And, my Mil-Spec trigger pull dropped from 6.75 pounds to 5.5 pounds. I haven't been able yet to see if it tightened my grouping, but I suspect it will. Another "Atta-boy" for M*Carbo!
Excellent item
review-star review-star review-star review-star review-star
It was a great upgrade in my opinion.
Easy Install, Crisp Feel
review-star review-star review-star review-star review-star
I had a decent mil-spec trigger with a 5.5lb break that I wanted to lighten up, but I didn't want to break the bank with a $100+ drop-in replacement trigger. I ordered this spring during a sale, followed the YouTube installation instructions, and my AR trigger is now 4 lbs and shoots beautifully.
Questions & Answers
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
As long as it has the standard AR15 FCG, this spring will work for you!
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

About This Item

AR-15 Trigger Spring Kit - What's Included:

  • Custom designed Lighter Hammer Spring.

The AR-15 Trigger Spring Kit will reduce your trigger pull from a factory weight of 6lbs to a modified weight of 4.5lbs. Your Trigger will properly function with all brands of Civilian ammo as well as Military green tip 5.56 ammo. This Kit is made of the highest quality spring steel available, right here in the USA. 

The AR-15 Trigger Spring Kit will improve your accuracy and tighten your shot groups. Reduced malfunctions should be expected because the trigger spring kit is constructed of the highest quality 302 stainless spring steel. The M*CARBO AR-15 Trigger Spring Kit was designed and tested to properly function with all brands of civilian and military grade ammunition. Expect an excellent AR 15 trigger pull weight reduction without compromising the reliability of your firearm.

                          

Q: Will this kit work for my AR-15 22 M&P Rifle?

A: 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.

Q: Will this kit work with 6.5 Creedmoor Ammunition Primers?

A: Yes it will function properly on 6.5 Creedmoor Ammunition Primers

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.

ARMY 5.56 MM Training Manual

AR-15 Exploded View

AR-15 Lower Exploded View

AR-15 Trigger Spring Kit Printable Instructions


Build your own AR-15 Lower

M*CARBO No Hassle 100% Lifetime Guarantee:

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

No Hassle 100% Lifetime Guarantee Ribbon

Drop Tested and Approved:

M*CARBO ASTM Spec Springs will offer a perfect trigger pull reduction with an unlimited drop test rating (3", 6", 9" & 12"+).

Drop Tested and Approved Icon

Range Tested and Approved:

The AR-15 Trigger Spring Kit has been tested with numerous brands of civilian and military grade ammunition to ensure reliable operation and safety.

Product Tested and Approved Sticker

Veteran Owned and Operated Business:

American-Made Upgrades designed and manufactured by Combat Veterans. We donate a portion of your purchase to the Military Foundations we humbly support.

Veteran Owned Business Ribbon


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 (262)
review-star review-star review-star review-star review-star
4.88
Doesn't work on Ruger AR556
review-star review-star review-star review-star review-star
Hate giving 1 star because it sounds like you're ticked off - I'm not. But I installed this in my Ruger AR556 and it made zero difference. The hammer spring has one less coil, so not sure why. Have already done the paracord break-in routine plus have over 2600 rounds through this gun, so the trigger should be well broken in. I don't know, seems like it should have worked. I'm open to suggestions, especially if you have a Ruger AR556 and it worked in your gun.
Ar 15 spring kit
review-star review-star review-star review-star review-star
Great little kit. Easy install. Can't ask for anything else. Thank you again.
Does the job!
review-star review-star review-star review-star review-star
I was looking for another option to improve my AR triggers besides the ALG purple spring. This fit the bill perfectly
great product
review-star review-star review-star review-star review-star
very happy easy to install trigger is so much better i have arthritis so it was hard for me now its perfect thanks keep up the great work.
review-star review-star review-star review-star review-star
Trigger pull is only a half pound different from factory. 7.5lbs factory, after installing spring, 7lbs...not happy with product. Waste of money and time.
Color me happy.
review-star review-star review-star review-star review-star
Notwithstanding the shipping time (5 days to go 90 miles, but that's the fault of USPS), color me happy. Installation was just as easy as the video indicated. And, my Mil-Spec trigger pull dropped from 6.75 pounds to 5.5 pounds. I haven't been able yet to see if it tightened my grouping, but I suspect it will. Another "Atta-boy" for M*Carbo!
Excellent item
review-star review-star review-star review-star review-star
It was a great upgrade in my opinion.
Easy Install, Crisp Feel
review-star review-star review-star review-star review-star
I had a decent mil-spec trigger with a 5.5lb break that I wanted to lighten up, but I didn't want to break the bank with a $100+ drop-in replacement trigger. I ordered this spring during a sale, followed the YouTube installation instructions, and my AR trigger is now 4 lbs and shoots beautifully.

Questions & Answers

5 Questions

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
As long as it has the standard AR15 FCG, this spring will work for you!
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

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