Sprinco USA M4 Carbine Buffer Spring
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Spro USA
Overview
The Sprinco USA M4 Carbine Buffer Spring is a carbine-length spring designed specifically for the AR-15 platform. This buffer spring plays a critical role in the cycling of the action, ensuring reliable function and helping to manage recoil in builds utilizing a carbine gas system. It is commonly found in 5.56 NATO caliber builds, making it a go-to choice for those looking to enhance the performance of their rifle.
Specifications
Available Merchants(4)
Prices checked
Price Alert
Build history on GunPartPicker
Builders have added the Spro USA Sprinco USA M4 Carbine Buffer Spring to their builds on GunPartPicker. Since April 2026, it ranks #42 of the 116 buffer springs builders have added.
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, but today only Brownells has it in stock. Prices barely moved in October 2026, holding around $19.99, with no real sale all month. Buying today, the lowest price is $19.99 at Brownells, which matches the best price we saw in October.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Read the guide: AR-15 Buffer Spring Guide →Check it against the live catalog:
Frequently Built With
The part most often added in each category by the builds that include this one
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CMMG AR-15 Mil-Spec Trigger KIT
CMMG AR-15 HD Pivot and Takedown Pin Parts KIT - 55AFF3B
Bravo Company Manufacturing MK2 Receiver Extension
ODIN Works Adjustable Buffer - 9mm - OS-ABS
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
Builds Featuring This Part
See all builds →Builds in the community that include the Sprinco Usa M4 Carbine Buffer Spring
| Build | Parts | Total |
|---|---|---|
 | 24 | $1126.99 |
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