The Geissele Automatics Super 42 Rifle-Length Buffer Spring, M-16/AR-15 (brand part number 04-308-F) upgrades a rifle-length AR buffer system with a spring engineered to flex rather than simply compress. Geissele Automatics builds the Super 42 from three independent strands of wire that act as a harmonic damper, absorbing excess energy that would otherwise stress a standard single-strand spring. The result is a rifle that runs more reliably and cycles quieter, with noticeably less of the twang sound that comes off a stock buffer tube. It drops straight into a standard mil-spec rifle-length buffer and buffer tube.

Key Specifications

• Sized for rifle-length buffer tubes.
• Uses three independent strands of wire rather than a single coil.
• Functions as a harmonic damper, letting the strands flex separately to absorb excess energy.
• Reduces the chance of spring failure compared to a standard single-strand spring.
• Diminishes the twang sound from the buttstock during cycling.
• Works with a standard mil-spec rifle-length buffer and buffer tube.

Frequently Asked Questions

What buffer tube does this spring fit? Standard mil-spec rifle-length buffer tubes.

How does the 3-strand design help? The independent strands flex separately, acting as a harmonic damper that reduces spring failure and cycling noise.

Buy the Geissele Automatics Super 42 Rifle-Length Buffer Spring, M-16/AR-15

Smooth out your rifle’s cycle with a spring from our AR buffer system selection. Order it from our Lubbock, Texas gun shop for fast, insured shipping.