My Account (Sign in)
Your basket is empty.
0
Basket
contact us by phone Help and contact
Free standard delivery over £199
100-day return policy
My Account (Sign in)
Shopping list
Your basket is empty. (0)
Basket
Newsletter Newsletter
Sale

Over 300,000 customers - we say thank you!

4.93/5 "Very good" (1400+ reviews)

40,000+ products for hunting and shooting sports

Home Rifle Parts Receiver Parts Recoil Parts Recoil Springs SPRINCO USA M4 CARBINE CS STANDARD SPRING KITS Support
Upgrade your M4 Carbine with the SPRINCO USA Standard Spring Kit. Enjoy reliable performance 🔧 without frequent replacements!

SPRINCO USA M4 CARBINE CS STANDARD SPRING KITS - SPRINCO USA SPRING KIT-STD BUFFER & HD 5-COIL BOLT EXTRACTOR SPRING

657780250097 943000039

Variations:

Upgrade your M4 Carbine with the SPRINCO USA Standard Spring Kit. Enjoy reliable performance 🔧 without frequent replacements!
SPRINCO USA SPRING KIT-STD BUFFER & HD 5-COIL BOLT EXTRACTOR SPRING
39.9 GBP 0 £39.90 *
Reordered
Reordered
39.9 GBP 0 £39.90 *
Ask question
Upgrade your M4 Carbine with the SPRINCO USA Standard Spring Kit! 🔧 Enjoy reliable performance without frequent replacements.
SPRINCO USA SPRING KIT-STD BUFFER & 4-COIL BOLT EXTRACTOR SPRING
39.9 GBP 0 £39.90 *
Reordered
Reordered
39.9 GBP 0 £39.90 *
Ask question
Upgrade your M4 Carbine with the SPRINCO USA Standard Power Buffer Spring for reliable performance. 🔧 Enjoy the benefits of a fresh Mil-Spec spring!
SPRINCO USA M4 CARBINE BUFFER SPRING
36.9 GBP 0 £36.90 *
Reordered
Reordered
36.9 GBP 0 £36.90 *
Ask question
36.9 39.9 3 GBP
39.9 GBP £39.90

Prices inclusive of duty & VAT.

Product no.: 943000039

Mfr. No.: 25009

657780250097 Standard Power Buffer Spring. Equivalent spring load to a brand new Mil-Spec M4 Carbine Spring. This spring will perform reliably in any properly configured and maintained 5.56 Carbine, if you wish to maintain the performance of a "fresh" Mil-Spec load spring without concern for replacement. This is the best choice for shooters and purists that wish to maintain the performance of most factory supplied new Mil-Spec springs, but do not wish to be concerned with frequent replacement of same or do not have the time or inclination to seek enhanced performance options. Just consider it as permanent new Mil-Spec spring.
Reordered
Be the first to rate this product

Backordered, delivery time approx. 4-12 weeks from the USA warehouse.

1
2
3
4
5
6
7
8
9
10+

Backordered, delivery time approx. 4-12 weeks from the USA warehouse.

Wish List Ask question

Variations:

Upgrade your M4 Carbine with the SPRINCO USA Standard Spring Kit. Enjoy reliable performance 🔧 without frequent replacements!
SPRINCO USA SPRING KIT-STD BUFFER & HD 5-COIL BOLT EXTRACTOR SPRING
39.9 GBP 0 £39.90 *
Reordered
Reordered
39.9 GBP 0 £39.90 *
Ask question
Upgrade your M4 Carbine with the SPRINCO USA Standard Spring Kit! 🔧 Enjoy reliable performance without frequent replacements.
SPRINCO USA SPRING KIT-STD BUFFER & 4-COIL BOLT EXTRACTOR SPRING
39.9 GBP 0 £39.90 *
Reordered
Reordered
39.9 GBP 0 £39.90 *
Ask question
Upgrade your M4 Carbine with the SPRINCO USA Standard Power Buffer Spring for reliable performance. 🔧 Enjoy the benefits of a fresh Mil-Spec spring!
SPRINCO USA M4 CARBINE BUFFER SPRING
36.9 GBP 0 £36.90 *
Reordered
Reordered
36.9 GBP 0 £36.90 *
Ask question

Description:

Standard Power Buffer Spring. Equivalent spring load to a brand new Mil-Spec M4 Carbine Spring. This spring will perform reliably in any properly configured and maintained 5.56 Carbine, if you wish to maintain the performance of a "fresh" Mil-Spec load spring without concern for replacement. This is the best choice for shooters and purists that wish to maintain the performance of most factory supplied new Mil-Spec springs, but do not wish to be concerned with frequent replacement of same or do not have the time or inclination to seek enhanced performance options. Just consider it as permanent new Mil-Spec spring.

Top takeaways

  1. The spring is designed to match the performance of a new Mil-Spec M4 Carbine Spring for reliable operation in any 5.56 Carbine.
  2. It is ideal for those who want to maintain "fresh" Mil-Spec spring performance without frequent replacements.
  3. SPRINCO USA's spring is a suitable option for shooters who prefer not to upgrade but desire consistent, long-term reliability.

Attributes

  • Delivery weight: 0.073kg
  • Shipping height: 25mm
  • Shipping width: 25mm
  • Shipping length: 337mm
  • UPC: 657780250097

Item details

Made in USA

Customers reviews

Customer ratings (0)

0 / 5

Customers also bought

Upgrade your rifle with Sprinco's M16/M4 Extractor Spring Kit! 💪 Experience enhanced reliability and performance for all 5.56 BBL lengths.
SPRINCO USA
SPRINCO USA UPGRADE KIT- XP 5-COIL EXTRACTOR SPRING, INSERT, O-RING
M16/M4 EXTRACTOR SPRING UPGRADE KITS
Extractor Springs
0
In stock
£12.90 £12.90 - £23.90
Enhance your M4 with the Sprinco USA Reduced Power Spring Kit! 🌟 Perfect for low power training and improved reliability.
SPRINCO USA
SPRINCO USA REDUCED POWER KIT BUFFER 4-COIL BOLT EXTRACTOR SPRING
M4 CARBINE CS REDUCED POWER SPRING KITS
 
0
Reordered
£39.90 £36.90 - £39.90
Upgrade your rifle with Sprinco's M16/M4 Enhanced Carrier Extractors! 💪 Reliable performance and extreme duty cycles for all shooters.
SPRINCO USA
SPRINCO USA ENHANCED 4-COIL BOLT CARRIER EXTRACTOR CS SPRING 3-PAK
M16/M4 ENHANCED CARRIER EXTRACTORS
Extractor Springs
0
Reordered
£19.90 £9.90 - £19.90
Upgrade your firearm with Sprinco's M16/M4 Bolt Extractor Springs! 💪 Experience enhanced reliability and performance for all your shooting needs.
SPRINCO USA
SPRINCO USA XP 5-COIL XP BOLT EXTRACTOR CS SPRING, SINGLE
M16/M4 BOLT EXTRACTOR SPRINGS
Extractor Springs
0
Not available
 
Upgrade your AR-15 with Sprinco's Mil-Spec Extractor Inserts & O-Rings! 🇺🇸 Quality you can trust, made in the USA for superior performance.
SPRINCO USA
SPRINCO USA BLACK EXTRACTOR INSERT & VITON O-RING
AR-15 EXTRACTOR INSERTS & O-RINGS MIL-SPEC
Extractor Springs
0
Not available
 
Site Navigation
Product Categories
Ordering
Customer Service

Welcome!

to Brownells UK, your destination for anything gun related. With our roots in a genuine passion for firearms, we bring you an unmatched selection of Gun Parts, Firearm Accessories, Gunsmithing Tools, Scopes & Red Dot Sights and Expert Knowledge.

Whether you're looking to maintain, repair, or upgrade, we've got what you need!

For Shooters, By Shooters
We share your enthusiasm and know exactly what you're looking for because we're part of the community.

Massive Selection
From the essentials to the unique, find everything under one roof.

Our blend of tradition and innovation
Shop with the convenience of modern technology, backed by a legacy of experience.

Browse our collection and discover why we're the trusted name in shooting sports & hunting.

Brownells Norge - Komplett utvalg av ladeutstyr, våpendeler, kuler, hylser, kikkerter, optikk og luftvåpen Brownells Österreich - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells Switzerland - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells Deutschland - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells France - Le plus grand fournisseur d'Accessoires pour le tir, Pièces détachées & Outils d'Armurier Brownells Iberica - El mayor proveedor de accesorios para el Tiro, Piezas y herramientas del armero. Brownells Sverige - Världens största leverantör av Vapendelar, Vapensmide Verktyg & Skyttetillbehör Brownells Suomi Brownells Italia - Il negozio del più grande rivenditore di componenti e accessori per armi da tiro, difesa e caccia Brownells Polska - Największy na świecie dostawca części broni, narzędzi rusznikarskich & akcesoriów strzeleckich Brownells Česko - Největší světový dodavatel součástí zbraní, střeleckého příslušenství a zbrojního nářadí
*
Prices inclusive of duty & VAT.

© 2025 Brownells UK
Part of the Brownells Europe Group

Logo Brownells
Classical viewClassical view Mobile viewMobile view
Back to top