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

Rifle Parts Receiver Parts Recoil Parts Recoil Springs SPRINCO USA REDUCED POWER KIT BUFFER 4-COIL BOLT EXTRACTOR SPRING Support
The Sprinco USA Reduced Power Buffer Spring is 20% lighter than the White spring, enhancing reliability for low power SRTA training or SIMS Rounds.
-9 %

SPRINCO USA REDUCED POWER KIT BUFFER 4-COIL BOLT EXTRACTOR SPRING

657780251490 943000043
Variations
Filters:
Variations:
-9 %
The Sprinco USA Reduced Power Buffer Spring is 20% lighter than the White spring, enhancing reliability for low power SRTA training or SIMS Rounds.
M4 CARBINE CS REDUCED POWER SPRING KITS - REDUCED POWER KIT BUFFER 4-COIL BOLT EXTRACTOR SPRING
39.9 GBP 3 £39.90 * £43.90 You save £4.00
In stock 3 pcs. in the USA warehouse
Product no.: 943000043
In stock 3 pcs. in the USA warehouse
39.9 GBP 3 £39.90 * £43.90
Ask question
-9 %
The SPRINCO USA Reduced Power Buffer Spring is 20% lighter than the White spring, enhancing reliability for low power SRTA training and SIMS rounds.
M4 CARBINE CS REDUCED POWER SPRING KITS - REDUCED POWER KIT BUFFER XP 5-COIL BOLT EXTRACTOR SPRING
39.9 GBP 1 £39.90 * £43.90 You save £4.00
In stock 1 pcs. in the USA warehouse
Product no.: 943000042
In stock 1 pcs. in the USA warehouse
39.9 GBP 1 £39.90 * £43.90
Ask question
The Sprinco USA M4 Carbine Reduced Power Buffer Spring is 20% lighter, ideal for low power training with SRTA or SIMS rounds, enhancing reliability and performance.
M4 CARBINE CS REDUCED POWER SPRING KITS - M4 CARBINE REDUCED POWER BUFFER SPRING
40.9 GBP 0 £40.90 *
Backorderable
Product no.: 943000044
Backorderable
40.9 GBP 0 £40.90 *
Ask question

Variations:

-9 %
The Sprinco USA Reduced Power Buffer Spring is 20% lighter than the White spring, enhancing reliability for low power SRTA training or SIMS Rounds.
M4 CARBINE CS REDUCED POWER SPRING KITS - REDUCED POWER KIT BUFFER 4-COIL BOLT EXTRACTOR SPRING
39.9 GBP 3 £39.90 * £43.90 You save £4.00
In stock 3 pcs. in the USA warehouse
Product no.: 943000043
In stock 3 pcs. in the USA warehouse
39.9 GBP 3 £39.90 * £43.90
Ask question
-9 %
The SPRINCO USA Reduced Power Buffer Spring is 20% lighter than the White spring, enhancing reliability for low power SRTA training and SIMS rounds.
M4 CARBINE CS REDUCED POWER SPRING KITS - REDUCED POWER KIT BUFFER XP 5-COIL BOLT EXTRACTOR SPRING
39.9 GBP 1 £39.90 * £43.90 You save £4.00
In stock 1 pcs. in the USA warehouse
Product no.: 943000042
In stock 1 pcs. in the USA warehouse
39.9 GBP 1 £39.90 * £43.90
Ask question
The Sprinco USA M4 Carbine Reduced Power Buffer Spring is 20% lighter, ideal for low power training with SRTA or SIMS rounds, enhancing reliability and performance.
M4 CARBINE CS REDUCED POWER SPRING KITS - M4 CARBINE REDUCED POWER BUFFER SPRING
40.9 GBP 0 £40.90 *
Backorderable
Product no.: 943000044
Backorderable
40.9 GBP 0 £40.90 *
Ask question
39.9 40.9 3 GBP
Sale
-9 %
MSRP £43.90
39.9 GBP £39.90 You save £4.00

Prices inclusive of duty & VAT.

Product no.: 943000043

Mfr. No.: 25149

657780251490 Reduced Power Buffer Spring. Sprinco collaborated with two prominent commercial ammunition manufacturers and two prominent gunsmiths to arrive at the design for the Yellow spring. It’s approximately 20% lighter than the White spring, and was the consensus choice out of 4 different evaluation samples provided to all parties. They all added in their final evaluations that if a particular gun needed a lighter spring, that the gas port should be enlarged for overall reliability. The Yellow spring is also appropriate for with low power SRTA training or SIMS Rounds for training operations.
In stock 3 pcs. in the USA warehouse
Be the first to rate this product
1
2
3
4
5
6
7
8
9
10+
Sale
-9 %
MSRP £43.90
You save £4.00
£39.90

Prices inclusive of duty & VAT.

1
2
3
4
5
6
7
8
9
10+

Delivery time approx. 7-14 days.

100-Day Return Policy

Free shipping starting at £199.00.
Delivery time approx. 7-14 days.

100-Day Return Policy
Wish List Ask question

Description:

Enhance your firearm's performance with the M4 Carbine CS Reduced Power Spring Kits!

The M4 CARBINE CS REDUCED POWER SPRING KITS by SPRINCO USA are designed to optimize your shooting experience. This Reduced Power Buffer Spring is engineered for reliability and performance.

Product Features:

  • Collaboratively designed with leading commercial ammunition manufacturers and expert gunsmiths.
  • Approximately 20% lighter than the traditional White spring, offering improved functionality.
  • Chosen as the best option from four different evaluation samples by industry professionals.
  • Ideal for firearms requiring a lighter spring, with a recommendation to enlarge the gas port for enhanced reliability.
  • Perfect for low power SRTA training or SIMS Rounds in training operations.

Upgrade your firearm with the SPRINCO USA Reduced Power Kit and experience the difference in your shooting performance.



Top takeaways

  1. The Yellow spring is approximately 20% lighter than the White spring, designed in collaboration with ammunition manufacturers and gunsmiths.
  2. For guns requiring a lighter spring, it's recommended to enlarge the gas port for better reliability.
  3. The Yellow spring is suitable for low power SRTA and SIMS Rounds in training operations.

Attributes

  • Delivery weight: 0.077kg
  • Shipping height: 25mm
  • Shipping width: 25mm
  • Shipping length: 337mm
  • UPC: 657780251490

Item details

Made in USA

Customers reviews

Customer ratings (0)

0 / 5

Variations:

-9 %
The Sprinco USA Reduced Power Buffer Spring is 20% lighter than the White spring, enhancing reliability for low power SRTA training or SIMS Rounds.
M4 CARBINE CS REDUCED POWER SPRING KITS - REDUCED POWER KIT BUFFER 4-COIL BOLT EXTRACTOR SPRING
39.9 GBP 3 £39.90 * £43.90 You save £4.00
In stock 3 pcs. in the USA warehouse
Product no.: 943000043
In stock 3 pcs. in the USA warehouse
39.9 GBP 3 £39.90 * £43.90
Ask question
-9 %
The SPRINCO USA Reduced Power Buffer Spring is 20% lighter than the White spring, enhancing reliability for low power SRTA training and SIMS rounds.
M4 CARBINE CS REDUCED POWER SPRING KITS - REDUCED POWER KIT BUFFER XP 5-COIL BOLT EXTRACTOR SPRING
39.9 GBP 1 £39.90 * £43.90 You save £4.00
In stock 1 pcs. in the USA warehouse
Product no.: 943000042
In stock 1 pcs. in the USA warehouse
39.9 GBP 1 £39.90 * £43.90
Ask question
The Sprinco USA M4 Carbine Reduced Power Buffer Spring is 20% lighter, ideal for low power training with SRTA or SIMS rounds, enhancing reliability and performance.
M4 CARBINE CS REDUCED POWER SPRING KITS - M4 CARBINE REDUCED POWER BUFFER SPRING
40.9 GBP 0 £40.90 *
Backorderable
Product no.: 943000044
Backorderable
40.9 GBP 0 £40.90 *
Ask question

Customers also bought

Oops! Something went wrong.

We encountered an error while loading this content. Please refresh the page to continue. If the issue persists, contact our customer support.

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