SOLGW A5H2 Buffer Kit with Green Spring - Black Finish

The SOLGW A5H2 Buffer Kit with Green Spring delivers the intermediate buffer system upgrade that Sons of Liberty Gun Works installs standard on their rifles—now available as a complete retrofit package for your AR-15 lower receiver. If you're running a mil-spec setup and want the benefits of A5-platform ergonomics and reliability, this kit gives you everything needed in one box: tube, spring, buffer, castle nut, and end plate.

The A5 buffer system has earned its reputation among serious shooters for smoother recoil impulse and faster lock time compared to carbine-length systems. This kit centers on a purpose-built 9-position aluminum tube with the diameter and thread profile to handle real-world use. You get a Sprinco rifle-length green spring paired with an SOLGW/BCM T2 buffer, both engineered to work together as a tuned unit. The hard-anodized finish means the tube resists corrosion and wear, while dry-film lubrication comes factory-applied—no extra prep needed.

Rounding out the kit: an FCD castle nut and B5 QD end plate, both MIL-SPEC and ready to lock down securely. This is a no-guessing upgrade path for shooters who've researched the A5 platform and want a complete, quality solution. Installation requires standard AR armorer knowledge; if you're not comfortable with lower receiver work, have a qualified gunsmith handle it.

Key Features

• Complete A5 intermediate buffer system kit—tube, spring, buffer, castle nut, and end plate
• 9-position aluminum tube with mil-spec diameter and rolled threads for secure fit
• Type 3 Class 2 hard-anodized finish for durability and corrosion resistance
• Dry-film lubrication applied at the factory
• Sprinco rifle-length green spring tuned for the A5 platform
• SOLGW/BCM T2 buffer optimized for smooth operation
• FCD CN5F castle nut and B5 QD end plate for secure assembly
• Drop-in upgrade for most AR-15 lower receivers

Specifications

Frequently Asked Questions

What AR-15 lowers does this A5H2 buffer kit fit?

This kit is designed to retrofit most mil-spec AR-15 lower receivers that accept standard buffer tubes. The mil-spec diameter and rolled threads ensure compatibility with standard receivers. If you have a proprietary lower or are unsure, check with the lower's manufacturer or consult a gunsmith before ordering.

What's the difference between A5 and carbine buffer systems?

The A5 intermediate platform uses a longer tube and larger diameter than carbine systems, allowing for tuning via multiple spring and buffer weight options. Many shooters report a smoother recoil impulse and faster lock time. This kit comes pre-paired with matched spring and buffer components from SOLGW and BCM for reliable performance out of the box.

Is the spring actually green, or might it come black?

The kit is spec'd with a Sprinco green spring, but Sprinco's manufacturing can result in springs that appear black rather than green depending on the anodizing lot. Functionally, there is no difference; this is a cosmetic variance only.

What's included in this kit, and do I need anything else?

The kit contains the A5 buffer tube, spring, buffer, castle nut, and quick-detach end plate—everything required to assemble a complete buffer system on your lower receiver. You'll need basic AR armorer tools (castle nut wrench, etc.) to install, but no additional parts are required.