Best AR-15 Trigger Spring Upgrade Kit

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  • Reduce your trigger pull from a stock 6 lbs to a modified 4.5 lbs
  • Improve accuracy and overall rifle performance
  • Kit includes a Custom Hammer Spring
  • Best AR 15 Trigger Upgrade Kit
  • Made of the highest quality 302 Stainless Steel Spring Wire
  • Protected by the MCARBO 100% Lifetime Guarantee
  • Made in the USA
  • Fast Same Day Shipping!

AR-15 Trigger Spring Kit consists of a custom designed and manufactured:

  1. Hammer Spring

The AR-15 Trigger Spring Kit will reduce your trigger pull from a factory weight of 6 lbs to a modified weight of 4.5 lbs. 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 MCARBO 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.

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.

100% Lifetime Guarantee:

The AR-15 Trigger Spring Kit is protected by the MCARBO 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.


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.


Veteran Owned and Operated Business:

American made gun parts designed and manufactured by Combat Veterans. We will donate 5% 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. Installation by MCARBO is available and recommended. Modifying your weapon may be prohibited in your state. Do not modify your sear or hammer engagement surfaces, with or without this 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.

Q: Will this kit work for my AR15-22 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

MCARBO 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.

ATTENTION: We advise that all parts purchased from our inventory be installed and inspected by a qualified gunsmith. Modifying your weapon my be prohibited in your state. 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 my be incurred.

Overall Customer Rating of 45 Reviews:
East Bay Area, CA

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Received the spring quickly and with great communication all the way through.

My AR trigger was already a decent performer. Stock it was at 5.5 lbs. The pull was on the lighter side for a stock AR but the break was a bit clunky for lack of a better term.

After installing this spring the pull was at 4.5-4.75 lbs. but the biggest difference to me was the break felt much crisper and just a bit more predictable.

I even put the stock spring back to make sure I was feeling what I though I was, and after another swap the improvement was definitely there.

I even went an extra step and popped in another mil-spec trigger that I have with a pull weight of 6.5 lbs and this spring dropped it close to 5.5 lbs.

And the best part - even more important that the pull weight - is the reliability did not change. A day on the range and the gun went bang every time.

VERY PLEASED.

Thank you

Works flawlessly!

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Installed the spring and went to the range immediately afterwards. Worked flawlessly with 3 different manufacturers ammo and my own reloads. Excellent product!! It was put in an Andersen lower and getting couple more for my Aero Precision pistol and my Spikes lower.

AR 15 trigger spring kit

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Excellent product, works just as described. Easy install w/ M*Carbo step by step video.

I could not be happier with M*Carbo products and their great, above and beyond customer service and follow up!!

Eastern Montana

Trigger spring replacement

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Very worth the money. Decreases takeup and lowers pull. Smooths out the trigger

trigger spring

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Excellent customer contact and fast shipping!

I installed the spring easily on my AR. Dropped the inconsistent 6.5 lb to a consistent 5 lb pull. I will install one on other rifles. Excellent product.