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This Sprinco kit tackles two of the most overlooked parts in an AR-15: the buffer spring and the extractor spring. Both come off the same Formula One grade chrome silicon wire stock Sprinco is known for, and the pairing is aimed at builders who want their carbine to run smooth and cycle clean without chasing down individual components.
The buffer spring in this kit is the Extra Power version, giving you meaningfully more spring load than a worn or standard Mil-Spec carbine spring. That added resistance helps slow down bolt carrier velocity, which is exactly what an over-gassed or suppressed rifle needs to settle its recoil impulse and toss brass to a consistent 3 to 4 o'clock instead of launching it into the next county. Sprinco treats every buffer spring with a re-micronized molybdenum disulfide coating that cuts down on mechanical wear, which is why you won't hear that familiar sproing sound over the buffer tube when you shoot.
The extractor spring side of this kit is the Enhanced 4-Coil, built to hold a new-Mil-Spec duty load and recommended for 18 inch and longer barrels, especially for folks who save their brass for reloading. It ships with a Mil-Spec black extractor insert and a Viton O-ring so you can dial in extractor tension to match your setup. Worth noting: Sprinco advises running the insert or the O-ring, not both together.
Sprinco extractor springs are heat treated, stress relieved, and cryogenically processed, and the company has documented over 200,000 rounds on a single extractor spring with performance specs holding steady up to 750 degrees. If your AR is double feeding, short stroking, or throwing brass in weird patterns, tired springs are often the culprit, and this kit swaps in fresh parts that are built to outlast the bolt they sit in. Installation is straightforward with basic tools and takes most people ten minutes or less.
The Extra Power buffer spring adds more load than a standard or worn Mil-Spec carbine spring, which slows bolt carrier velocity and smooths out the recoil impulse. That's a big help on over-gassed or suppressed rifles that are running the action too hard. Many builders notice more consistent ejection and less brass damage after the swap.
No. Sprinco recommends using either the black extractor insert or the Viton O-ring, but not both at the same time. Both are included so you can tune extractor tension to your specific bolt and setup, and plenty of people run the spring on its own with great results.
The 4-Coil Enhanced spring holds a new-Mil-Spec duty load and is recommended for 18 inch and longer barrels, which makes it a solid pick for DMR-style builds and anyone saving brass for reloading. If you're running a shorter carbine or SBR and want more aggressive extraction, Sprinco's 5-Coil Extra Power spring is the stronger option.
It's a straightforward job that most people knock out in around ten minutes with basic tools. The buffer spring drops right into the receiver extension, and the extractor spring swaps into the bolt after you punch out the extractor pin. No gunsmithing required.
| UPC | 657780254064 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 25406 |
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