Geissele Automatics Super 42 Buffer & Spring H3 (05-495-H3)

The Geissele Automatics Super 42 Buffer & Spring H3 is a direct retrofit upgrade for AR-15 pattern rifles looking to improve bolt carrier reliability and reduce wear. Designed around a unique three-strand spring concept, this buffer and spring combo handles the heavy lifting that stock setups leave on the table—particularly when running steel-case ammunition or shooting with a fouled action.

The Super 42's independent-strand design works like a harmonic damper, allowing each strand to flex separately and absorb energy more effectively than conventional single-coil springs. This multi-strand flex disperses excess force throughout the system rather than concentrating it at failure points, translating to longer spring life and fewer reliability surprises downrange. The system also delivers a measurable upgrade in return force—15% stronger average return than standard buffer springs—which matters when you need consistent round-stripping performance under real-world conditions.

Beyond raw function, shooters notice the elimination of spring twang—that reverberating vibration transmitted through the buttstock on every shot cycle. The H3 buffer included with this assembly is tuned to work in tandem with the spring's increased force, creating a balanced system that resists the tendency of springs to lose tension and length over extended round counts. This combo is designed for carbine-length buffer tubes only; it will not function in rifle-length or A5 systems.

Key Features

• Three independent spring strands reduce concentrated stress and extend service life
• 15% stronger average return force than standard AR-15 buffer springs
• Harmonic damping design absorbs excess energy and improves reliability
• Eliminates spring vibration (twang) felt through the buttstock
• Includes H3 buffer assembly, ready to install
• Better performance with steel-case ammunition and dirty actions
• Maintains spring tension and force over high round counts

Specifications

Frequently Asked Questions

Will the Geissele Super 42 H3 work with my AR-15?

The Super 42 H3 is designed for AR-15 pattern rifles with carbine-length buffer tubes. It is not compatible with rifle-length or A5 buffer tube systems, so confirm your receiver extension type before ordering.

What does the H3 buffer weight mean?

The H3 designation refers to the buffer weight and is engineered to pair with the Super 42 spring's increased return force. Together they create a balanced system optimized for reliable cycling and energy absorption.

Does this come with everything I need to install?

Yes, the Super 42 Buffer & Spring H3 includes both the spring assembly and the H3 buffer. You'll have everything needed for a drop-in upgrade to your carbine-length buffer tube.

Why is the three-strand spring design better?

The three independent strands work as a harmonic damper, allowing each to flex separately rather than acting as a single unit. This distributes energy more evenly, reduces stress concentration, and helps the spring maintain its force and length over thousands of rounds—especially important when running steel-case or shooting with a dirty action.