Spro USA

Sprinco USA Reduced Power KIT Buffer 4-Coil Bolt Extractor Spring

Spro USA Sprinco Usa Reduced Power Kit Buffer 4-Coil Bolt Extractor Spring - Buffer Spring for AR-15 - view 1
Spro USA Sprinco Usa Reduced Power Kit Buffer 4-Coil Bolt Extractor Spring - Buffer Spring for AR-15 - view 2
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Spro USA

Overview

The Sprinco USA Reduced Power Kit Buffer 4-Coil Bolt Extractor Spring is designed to provide a lighter extraction force for your bolt carrier group, which can improve reliability in certain builds. By reducing the spring tension, this component allows for smoother operation, particularly in systems where a lighter buffer is preferred. This spring is commonly found in pistol builds chambered in 5.56 NATO, where enhanced cycling and reduced recoil can be beneficial.

Specifications

MPN25149
PowerReduced

Available Merchants(2)

Prices checked

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Brownells
Free shipping over $99
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$21.99
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Palmetto State Armory logo
Palmetto State Armory
$9.99 shipping (free over $99)
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Out of Stock
$23.39
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Build history on GunPartPicker

Builders on GunPartPicker first added the Spro USA Sprinco USA Reduced Power KIT Buffer 4-Coil Bolt Extractor Spring to a build in February 2026. Builds with this buffer spring are split between 5.56 NATO (58%) and .308 Win (17%) and mostly AR-15 (82%, then AR-10 18%).

Today none of the 2 retailers we track has it in stock right now. Listed prices start at $21.99 at Brownells for when it comes back.

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Frequently Built With

The part most often added in each category by the builds that include this one

Bravo Company Manufacturing MK2 Recoil Mitigation System - Mod 1 - T2

Bravo Company Manufacturing MK2 Recoil Mitigation System - Mod 1 - T2

Buffer Tube$124in 88% of them
Geissele Automatics AR-15 Ultra Precision 5 Axis Trigger Guard Ddc

Geissele Automatics AR-15 Ultra Precision 5 Axis Trigger Guard Ddc

Trigger Guard$42in 63% of them
FN America Take Down Pin

FN America Take Down Pin

Takedown Pinin 63% of them
Norgon Ambi-Catch

Norgon Ambi-Catch

Magazine Release$125 · out of stockin 50% of them
Freedom Ordnance FG-15 Trigger Actuating Grip - FG-15

Freedom Ordnance FG-15 Trigger Actuating Grip - FG-15

Pistol Grip$285 · out of stockin 50% of them
Franklin Armory 2012 BFS Marked Stripped Lower Receiver

Franklin Armory 2012 BFS Marked Stripped Lower Receiver

Lower Receiver$81in 44% of them

Build Configuration Breakdown

Aggregated and anonymized data showing how builders use this product

Platform

82.4%
AR-1582.4%
AR-1017.6%

Caliber

58.3%
5.56 NATO58.3%
.308 Win16.7%
7.62x51 NATO16.7%
6.5 Creedmoor8.3%

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