Sprinco USA Spring KIT- Enhanced Buffer & 4-Coil Bolt Extractor Spring
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Spro USA
Overview
The Sprinco USA Spring Kit features an enhanced buffer spring designed for the AR-15 platform, ensuring smoother operation and improved reliability during cycling. The included 4-coil bolt extractor spring provides additional tension, optimizing the extraction process and reducing the likelihood of failures. This spring kit is commonly found in builds utilizing a rifle gas system and chambered in .308 Win, making it a suitable choice for those looking to enhance performance in larger caliber setups.
Specifications
Build history on GunPartPicker
Builders have been adding the Spro USA Sprinco USA Spring KIT- Enhanced Buffer & 4-Coil Bolt Extractor Spring to their builds on GunPartPicker since March 2026. All time, it ranks #23 of the 90 buffer springs builders have added. Builds with this buffer spring are nearly all chambered in .308 Win, nearly all on rifle-length gas, and nearly all AR-10.
It was out of stock everywhere we track for all of August 2026, and today none of the 2 retailers we track has it in stock right now. Listed prices start at $21.54 at BattleHawk Armory for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 retailers
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Frequently Built With
The part most often added in each category by the 15 builds that include this one
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