Sprinco Usa 308 M4 Extension Tube Cs Xp Buffer Spring In Hard Tube

The Sprinco USA 308 M4 Extension Tube CS XP Buffer Spring delivers the heavy recoil control that modern .308 and large-caliber AR-platform rifles demand. If you're running a .308 Winchester, 6.5 Creedmoor, .260 Remington, or other magnum rounds through an AR-10 or DPMS-pattern carbine, this extra-extra-power orange spring is engineered to tame the harder impulse and keep your action cycling smoothly. It's built for shooters who refuse to compromise on consistency—whether you're dialing in precision at the range, hunting at distance, or running courses with heavy-hitting calibers.

Sprinco's orange spring is significantly stouter than their red counterpart, purpose-built for the demanding requirements of 16-inch to 18-inch mid-length gas carbines and robustly gassed setups. It works with standard 7-inch depth M4 extension tubes and short 2.5-inch buffers (including heavy aftermarket options), making it a go-to choice for tuning rifles that run hot. If you're dealing with an over-gassed rifle in .308, 6.5 CM, or similar heavy calibers, this spring brings the symmetry back to your BCG's forward and backward travel.

The hard-tube design adds durability and ensures consistent spring performance shot after shot. Whether you're building a precision rifle platform or troubleshooting a rifle that's beating itself to pieces, this buffer spring addresses the root cause of erratic cycling in heavier calibers.

Key Features

• Extra-extra-power (XP) orange spring for maximum recoil mitigation
• Designed for .308, 6.5 Creedmoor, .260 Remington, and equivalent heavy-caliber AR platforms
• Compatible with standard 7-inch depth M4 extension tubes and short 2.5-inch buffers
• Works with both stock and heavy aftermarket buffer options
• Hard-tube construction for long-term durability
• Ideal for tuning over-gassed rifles in large-caliber applications

Specifications

Frequently Asked Questions

What calibers does the Sprinco XP orange spring work with?

This spring is engineered primarily for .308 Winchester, 6.5 Creedmoor, .260 Remington, and other heavy-caliber applications in AR-10 and DPMS-pattern rifles. It's also been proven effective for tuning over-gassed rifles in equivalent heavy calibers.

Will this spring work with my AR-10 setup?

Yes. The Sprinco 308 M4 Extension Tube CS XP spring is designed to work with AR-10 and DPMS-pattern rifles using standard 7-inch depth M4 extension tubes and short 2.5-inch buffers, including heavy aftermarket buffer options.

How does this spring differ from Sprinco's red spring?

The orange XP spring is much stouter and provides significantly more recoil control than the red spring. It's engineered for the heavier impulse of magnum calibers and over-gassed rifle setups.

Is this spring good for tuning an over-gassed rifle?

Yes. The extra-extra-power orange spring is a proven solution for tuning over-gassed rifles running heavy calibers like .308 and 6.5 CM, helping restore consistent bolt carrier group cycling.