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This kit bundles two of Sprinco's most popular AR-15 reliability upgrades into one package: the Blue Enhanced Power carbine buffer spring and their 4-coil bolt extractor spring kit. If you've got a carbine that feels a little snappy or overgassed, this is the combo a lot of builders reach for first. The Blue buffer spring adds roughly 15% more return force than a standard mil-spec spring, which helps settle the recoil impulse, tame bolt bounce, and clean up ejection patterns without going crazy on buffer weight.
The Blue spring is Sprinco's medium Enhanced Power option, color coded blue so you always know what's in your tube. It shines on non-suppressed 12.5 to 14.5 inch SBRs, 16 inch mid-length DI guns, and mid-length uppers running adjustable gas blocks. Most folks pair it with an H2 or ST-T2 buffer, though gas port sizes vary wildly these days, so a little tuning never hurts. Build quality is where Sprinco earns its reputation: ASTM certified chrome silicon wire stock, heat treated, stress relieved, dual-stage shot peened, and moly plated. That translates to a service life well past 30,000 rounds, meaning this is likely the last buffer spring your carbine ever needs.
The Enhanced 4-coil extractor spring is the move for anyone running 18 inch and longer barrels who wants to save their brass. It holds the load of a fresh mil-spec extractor spring, so you get reliable extraction that's easier on case rims than the hotter 5-coil option. The extractor kit includes a Mil-Spec black extractor insert and a Viton O-ring, and it's made from the same chrome silicon stock that's been heat treated, stress relieved, and cryogenically processed for long haul durability.
Between the two springs, you're covering both ends of your rifle's cycle with parts that hold their tension through serious round counts. It's a simple, affordable upgrade that punches way above its weight for felt recoil and reliability.
The Blue Enhanced Power spring is dialed in for non-suppressed 12.5 to 14.5 inch SBRs, 16 inch mid-length DI barrels, and mid-length uppers with adjustable gas blocks. It fits standard carbine and mil-spec buffer tubes and is most often paired with an H2 or ST-T2 buffer. Since gas port sizes vary a lot between builds, you may need to tune the buffer weight to your specific rifle.
The Enhanced 4-coil spring maintains the load of a fresh mil-spec extractor spring, making it the recommended pick for 18 inch and longer barrels. It's easier on your case rims, which is a big deal if you reload and want to recover clean brass. The hotter 5-coil option adds more pressure but can be aggressive on case rims in longer-barreled guns.
Sprinco rates these springs at a service life well in excess of 30,000 rounds, with buffer spring designs engineered for over 1.5 million compression cycles. The chrome silicon construction, heat treating, and shot peening keep tension consistent through high round counts. For most owners, this ends up being the only buffer spring the rifle will ever need.
No, the kit includes the Blue Enhanced Power buffer spring and the 4-coil extractor spring assembly, not a buffer. The buffer spring is commonly matched with an H2 or ST-T2 buffer for best results, which you'd source separately. The extractor side comes with the Mil-Spec insert and Viton O-ring needed to complete that install.
| UPC | 657780250486 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 25048 |
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