Geissele Automatics Premium Mil-Spec Buffer Tube Assembly with Super 42 H1 Buffer, Black

Geissele Automatics Premium Mil-Spec Buffer Tube Assembly with Super 42 H1 Buffer, Black

The Geissele Automatics Premium Mil-Spec Buffer Tube Assembly combines a mil-spec 7075-T6 aluminum carbine receiver extension with a castle nut, end plate, Super 42 triple-braided buffer spring, and H1 buffer. Designed for compatible AR-15 carbine and mid-length gas-system builds, this complete package simplifies buffer-system selection while providing durable Geissele components in one black-finished assembly.

Complete Mil-Spec Buffer System Package

Instead of sourcing receiver extension components individually, this Geissele assembly provides the core parts needed for a compatible AR-15 carbine buffer system. The package includes the buffer tube, end plate, castle nut, Super 42 buffer spring, and H1 buffer.

7075-T6 Mil-Spec Diameter Buffer Tube

The receiver extension is constructed from 7075-T6 aluminum and uses a mil-spec diameter to accept compatible mil-spec carbine stocks. Its Type III hardcoat anodized black finish helps protect the buffer tube from routine wear and corrosion.

Super 42 Triple-Braided Buffer Spring

Geissele’s Super 42 Braided Wire Buffer Spring uses a three-strand braided design intended to improve energy absorption and harmonic dampening during the rifle’s cycling process. The spring design supports smooth function while helping reduce wear on compatible AR-15 buffer systems.

H1 Buffer for Carbine and Mid-Length Configurations

An H1 buffer is included for compatible AR-15 rifles with carbine- or mid-length gas systems. Because correct buffer selection depends on the complete rifle configuration, confirm that an H1 buffer is appropriate for your barrel, gas system, ammunition, and intended use before installation.

Key Features

• Geissele Automatics premium AR-15 buffer tube assembly
• Mil-spec diameter carbine buffer tube
• 7075-T6 aluminum receiver extension
• Black Type III hardcoat anodized finish
• Includes castle nut and end plate
• Includes Super 42 triple-braided buffer spring
• Includes H1 recoil buffer
• Optimized for compatible carbine- and mid-length gas-system rifles

Specifications

• Brand: Geissele Automatics
• Platform: AR-15
• Product Type: Mil-spec buffer tube assembly
• Buffer Tube Material: 7075-T6 aluminum
• Buffer Tube Diameter: Mil-spec
• Finish: Type III hardcoat anodized
• Color: Black
• Included Spring: Super 42 triple-braided buffer spring
• Included Buffer: H1 recoil buffer
• Included Hardware: Castle nut and end plate
• Recommended Gas Systems: Carbine and mid-length
• Listed Weight: 4 oz.

Compatibility

• Designed for compatible AR-15 carbine buffer-system configurations
• Accepts compatible mil-spec diameter carbine stocks
• Optimized for compatible AR-15 rifles using carbine- or mid-length gas systems

Not Compatible With

• Commercial-diameter carbine stocks
• AR-10, LR-308, and other large-frame platforms unless component compatibility is specifically verified
• Rifle-length buffer systems
• Configurations requiring a buffer weight other than H1

Important Notes

• This assembly uses a mil-spec diameter buffer tube; confirm that your selected stock is mil-spec diameter.
• Verify that an H1 buffer is appropriate for your rifle’s barrel length, gas system, ammunition, and complete configuration.
• Follow proper firearm assembly procedures and applicable laws when installing components.

Frequently Asked Questions

What is included with this Geissele buffer tube assembly?

The assembly includes a mil-spec 7075-T6 aluminum buffer tube, castle nut, end plate, Super 42 triple-braided buffer spring, and H1 buffer.

What type of stock fits this buffer tube?

This assembly uses a mil-spec diameter buffer tube and accepts compatible mil-spec carbine stocks.

Will a commercial-diameter stock fit this buffer tube?

No. Commercial-diameter stocks are not compatible with this mil-spec diameter receiver extension.

What is the Super 42 buffer spring?

The Super 42 is Geissele’s triple-braided wire buffer spring, designed to support energy absorption and harmonic dampening during rifle cycling.

What buffer weight is included?

This assembly includes an H1 recoil buffer.

What gas systems is this assembly optimized for?

It is optimized for compatible AR-15 rifles with carbine- and mid-length gas systems.

Will this work with an AR-10 or LR-308?

It is specified for the AR-15 platform. Large-frame AR configurations require separate verification of all buffer-system dimensions and compatibility.

Does the assembly include the castle nut and end plate?

Yes. Both the castle nut and end plate are included.

Upgrade Your AR-15 Buffer System with Geissele Components

For a convenient, quality-focused buffer-system solution, the Geissele Premium Mil-Spec Buffer Tube Assembly brings together the receiver extension, hardware, Super 42 spring, and H1 buffer in one package. Confirm fitment for your rifle and stock, then complete your compatible AR-15 build with a matched Geissele buffer system.

California Proposition 65 Warning: This product can expose you to chemicals known to the State of California to cause cancer and reproductive harm. For more information, visit www.P65Warnings.ca.gov.