BattleSteel AR15/M4 Complete Mil-Spec Replacement Spring Kit

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0.10 LBS



Battle Steel AR15/M4 Mil-Spec Spring Kit. Original OEM & US Government Manufacturer 100% MADE IN USA.

US Gorernment Part Number & Description

  • 8448633 - Bolt Catch Spring
  • 8448583 - Buffer Retainer Spring
  • 9390022 - Carbine Action Spring
  • 8448594 - Disconnector Spring
  • 8448532 - Ejection Port Cover Spring
  • 8448516 - Ejector Spring
  • 8448504 - Firing Pin Retaining Pin
  • 8448540 - Forward Assist Spring
  • 8448574 - Front Sight Detent Spring
  • 8448611 - Hammer Spring
  • 8448637 - Magazine Catch Spring
  • 8448585 - Pivot Detent Pin
  • 8448586 - Pivot Detent Pin Spring
  • 8448516 - Safety Detent Spring
  • 8448631 - Safety Selector Detent
  • 8448585 - Takedown Detent Pin
  • 8448586 - Takedown Detent Pin Spring
  • 8448593 - Trigger Spring
  • 12999901 - Extractor Spring

 Disclaimer: Images by Windham Weaponry, Inc 2016.


The Battle Steel AR15/M4 Complete Mil-Spec Replacement Spring Kit is a top-notch solution for maintaining your firearm's performance. This kit, proudly manufactured in the USA by the original OEM & US Government supplier, includes a comprehensive range of essential springs for your AR15/M4. Each spring is crafted to precise Mil-Spec standards to ensure optimal functionality. From the bolt catch spring to the trigger spring, this kit covers all your replacement needs. With genuine US Government part numbers and descriptions, you can trust the quality and reliability of these components. Keep your rifle in top condition with the Battle Steel Spring Kit.

WARNING This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to You must be 18+ years old to shop and or purchase on our website and 21+ to purchase Ammunition/Firearms. Check local laws before ordering as you certify you are of legal age and satisfy all federal, state, and local legal/regulatory requirements. There are NO returns or exchanges on armor, firearms, ammunition, PPE equipment. Ammo ships UPS ground to the lower 48 states.
We reserve the right to fix any critical errors.

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6 Reviews

  • 3


    Posted by Drew on 11th Apr 2023

    I have only used the buffer spring from this kit. The spring is larger in diameter than any other spring I have ever seen and it will not allow the weapon to cycle.

  • 4

    Spring Kit

    Posted by Chris on 15th Feb 2022

    Very complete, including a couple springs I didn't even think of. I got them for my parts box as extras, very pleased with all the springs for the price.

  • 5

    Great spare parts kit

    Posted by Marty on 27th Dec 2021

    Excellent item at excellent price. Even includes buffer spring.

  • 5


    Posted by Brian Schieck on 6th Dec 2021

    This is very handy to have for repairs

  • 4

    Mil Spec spring kits

    Posted by Steve J on 11th Apr 2020

    Arrived as described and in a padded envelope. I hope they offer a NibX version in the future

  • 5

    All the springs you need

    Posted by Bobby Buce on 7th Apr 2020

    Great item to finish out my spare parts box. Every spring you could possibly need. Great price. Highly recommend.

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