The Sprinco Red extra power carbine buffer spring (Sprinco part no. 25004) is the spring Sprinco points to for moderately gassed .308, 6.5 Creedmoor and .260 Remington AR-10 pattern carbines. Its design load is about 25 percent greater than Sprinco’s White standard spring, which gives a tuning step up when a heavier cartridge or a heavier buffer needs more control of the carrier. The spring is wound from certified valve-quality chrome silicon wire, heat treated, stress relieved and shot-peened, then moly plated. It ships in a hard plastic tube, and the red color code tells you the rate at a glance.

Key Specifications

• The rate is extra power, with a design load about 25 percent greater than Sprinco’s White standard spring.
• The color code is red, applied during quality control so the spring rate can be identified.
• It is a carbine buffer spring for M4 and CAR-15 style carbine receiver extensions.
• Sprinco recommends it for moderately gassed .308, 6.5 Creedmoor and .260 Remington carbines using AR-10 pattern receiver extensions and 3.25-inch carbine buffers.
• The wire is certified valve-quality chrome silicon (ASTM A877), heat treated and stress relieved.
• Processing includes dual-stage shot peening after winding, which Sprinco says gives consistent spring pressure through the duty cycle.
• The spring is moly plated and packed in a hard plastic tube for protected storage.

Frequently Asked Questions

Will this spring work in a DPMS-pattern .308 carbine? Sprinco says the Red spring is not for DPMS-pattern .308 carbines that use standard 7-inch deep M4 extension tubes and short 2.5-inch buffers. For that platform Sprinco makes its Orange spring.

Is this a rifle-length buffer spring? No. This is a carbine spring. Sprinco sells a separate Green spring for A1 and A2 fixed-stock rifle-length receiver extensions with rifle-length buffers.

How much heavier is the Red spring than the standard spring? Sprinco gives the Red spring a design load of roughly 25 percent more than its White standard-power spring.

Buy the Sprinco Red Extra Power Carbine Buffer Spring for AR .308

Tuning a gas-operated AR is a matter of matching spring rate, buffer weight and gas volume, and the spring is the cheapest part of that equation to change. Order this Sprinco spring from our Lubbock, Texas gun shop for fast shipping, and see more rifle parts while you are here.