Sprinco Usa Spring Kit Std Buffer Spring&Enhanced 4Coil Extract Spring

The Sprinco USA Spring Kit pairs a standard rifle-length buffer spring with an enhanced four-coil extractor spring, giving you the core recoil management and reliable extraction components AR platform shooters depend on. Whether you're running a fixed A1/A2 stock setup or stepping up to an intermediate-depth VLTOR A5 buffer tube, this kit delivers the spring rates that keep your action cycling smoothly across a range of loads and configurations.

The standard buffer spring in this kit follows mil-spec design principles and works reliably in rifle-length tubes with lighter to mid-range calibers like .223 Remington, 5.56 NATO, 6.8 SPC, 6.5 Grendel, and 7.62×39. It's equally at home in longer-barreled .308 Winchester, 6.5 Creedmoor, or .260 Remington builds—especially when paired with appropriately weighted buffers to manage recoil and cycle reliability. The enhanced extractor spring rounds out the package, ensuring consistent round feeding and reliable extraction across your shooting sessions, whether at the range or in the field.

This is a straightforward, no-fuss component upgrade for builders and shooters who know exactly what they need: proven spring performance without guesswork or gimmicks. If you're assembling an AR platform rifle, troubleshooting cycling issues, or simply refreshing worn internals with known-good parts, Sprinco's reputation for consistency makes this kit a logical choice.

Key Features

• Standard rifle-length buffer spring with mil-spec load characteristics
• Compatible with A1/A2 fixed stock receiver extensions and VLTOR A5 buffer tubes (7.75" depth with 4" A5 buffers)
• Enhanced four-coil extractor spring for reliable case extraction
• Suitable for .223 Remington, 5.56 NATO, 6.8 SPC, 6.5 Grendel, and 7.62×39 builds
• Works with longer-barreled rifle-length platforms in heavier calibers when paired with appropriate buffer weights

Specifications

Frequently Asked Questions

Will this buffer spring work with my A5 buffer tube?

Yes. The standard spring in this kit is popular in VLTOR A5 buffer tubes with 4-inch A5 buffers and is compatible with the 7.75-inch intermediate depth tube.

Can I use this spring for heavier calibers like .308?

The standard spring can be used in longer-barreled rifle-length .308 and 6.5 Creedmoor builds, though pairing it with an appropriately weighted buffer (such as H2 or H3 carbine buffers) is recommended to manage recoil and ensure reliable cycling. For unsuppressed 7.62×51, a heavier spring may be more effective.

What does the enhanced extractor spring add to this kit?

The four-coil extractor spring is designed to provide consistent and reliable extraction across your shooting, complementing the buffer spring to round out the core recoil and feeding systems.

Is this kit suitable for .223 and 5.56 NATO?

Yes. This standard-power kit is engineered for use with .223 Remington, 5.56 NATO, and similar intermediate cartridges in rifle-length configurations.