The Geissele Premium Mil-Spec Buffer Tube is precision machined from 7075-T6 aluminum and finished with a durable Type III hardcoat anodize. Built to true mil-spec dimensions, this carbine-length, mil-spec diameter buffer tube features six adjustable stock positions. Made in the USA and weighing 3.7 oz, it offers a precise fit for AR-15 lowers and broad compatibility with most mil-spec diameter stocks. A high-quality mil-spec castle nut and end plate are included for complete installation.
The Geissele Super 42 Spring is engineered to enhance the performance and reliability of AR-15 pattern rifles. Its innovative three-strand braided wire design—modeled after the German MG42 concept—acts as a harmonic damper and energy absorber, allowing each strand to flex independently. This reduces stress, improves durability, and lowers the risk of spring failure.
Compared to a standard buffer spring, the Super 42 maintains its length and force over extended round counts while eliminating the common “twang” felt through the buttstock. With approximately 15% greater average return force, it improves feeding reliability, especially in dirty conditions or when using steel-case ammunition.
Key Features
Premium Mil-Spec Buffer Tube
- 7075-T6 aluminum construction
- Type III hardcoat anodized finish
- Carbine length, mil-spec diameter
- Six-position adjustable design
- Weighs 3.7 oz
- Includes mil-spec castle nut and end plate
- Made in the USA
Super 42 Spring
- Three-strand braided wire design
- Functions as harmonic damper
- Reduces spring “twang”
- Maintains length and force over time
- ~15% stronger return force
- Enhances reliability in harsh conditions
Anodize Variations & Lighting Effects
You may notice that colored anodized parts can appear in varying shades and look different under different lighting conditions. Why sell parts like this? Because with the high-quality anodize we use, achieving perfectly consistent color is simply not possible.
Note: The Super 42® Spring is designed for use with carbine-length buffer tubes only and is not compatible with rifle-length or A5 buffer tubes/receiver extensions. It is not recommended for use with .300 Blackout subsonic ammunition, as the increased spring force may prevent proper cycling and reliable function.
