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Brownells

Ar-15/M16 A2 Rifle Buffer Tube Assembly - A2 Rifle Stock Completion Kit

Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.

Complete Kit

Includes the components needed to

Stock Conversions,

Including setups that accept a

A2 Kit

Includes the correct buttstock spacer

Fits Standard,

Mil-spec AR-15/M16/M4 lower receivers and

Installation Instructions

Are included

$71.99
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SKU: 080000554

Overview

This kit is designed to help you set up a fixed rifle stock on a standard AR-15/M16/M4 lower receiver or compatible clone. It includes the components needed for stock conversion work, along with the A2 buttstock spacer required for A2 rifle stocks. The assembly is built around aluminum, steel, and anodized matte black parts, with installation instructions included for a straightforward fit. For hunters and shooters configuring a rifle for a fixed-stock setup, it offers a practical parts package without unnecessary extras.

Why Hunters Choose the Brownells

Complete Kit

Includes the components needed to

Suitable Stock

Conversions to a fixed rifle

Includes Correct

Buttstock spacer required for A2

Fits Standard

Mil-spec AR-15/M16/M4 lower receivers and

Installation Instructions

Are included for straightforward setup

Key Features

  • Complete kit includes the components needed to mount a buttstock on an AR-15 rifle.
  • Designed for stock conversions, including setups that accept a fixed rifle stock.
  • A2 kit includes the correct buttstock spacer required for A2 rifle stocks.
  • Fits standard, mil-spec AR-15/M16/M4 lower receivers and clones.
  • Installation instructions are included.
  • Components are made to strict dimensional tolerances for proper fit and function.

Best Used For

  • AR-15 owners converting a rifle to a fixed A2-style stock setup
  • Builders needing a complete kit for standard mil-spec lower receiver compatibility
  • Shooters replacing an existing buttstock with a secure, properly fitted assembly
  • Users wanting the included A2 spacer for an A2 rifle stock installation

Specifications

A2 Stock Spacer FinishAnodized, matte black
A2 Stock Spacer MaterialAluminum
Buttstock Spacer For A2 Rifle StocksYes
FitStandard, mil-spec AR-15/M16/M4 lower receiver and clones
Installation Instructions IncludedYes
Lock Ring MaterialSteel
Receiver Extension FinishAnodized, matte black
Receiver Extension MaterialAluminum
Receiver Plate MaterialSteel
Recoil Buffer MaterialAluminum and steel
Spring MaterialSteel

Pros

  • Complete kit includes the components needed to mount a buttstock of your choice.
  • Suitable for stock conversions to a fixed rifle stock configuration.
  • Includes the correct buttstock spacer required for A2 rifle stocks.
  • Fits standard mil-spec AR-15/M16/M4 lower receivers and clones.
  • Installation instructions are included for straightforward setup.

Considerations & Trade-offs

  • Designed for standard, mil-spec AR-15/M16/M4 lower receivers and clones, so compatibility is not universal across all platforms.
  • This is a completion kit, not a complete buttstock; the stock itself is not included.
  • The A2 version adds the correct buttstock spacer, which is useful for A2 stock setups but may be unnecessary for other fixed-stock configurations.
  • Installation instructions are included, but the kit is intended for stock conversion work, so proper installation still depends on the user’s setup and parts selection.

Suggested Comparisons

  • AR-15/M16 fixed stock kits
  • AR-15 buffer tube assemblies
  • AR-15 lower receiver stock conversion parts
  • A2 rifle stock components

Suggested Accessories

  • AR-15/M16 fixed rifle stock
  • Buttstock spacer
  • Receiver extension
  • Installation instructions

Frequently Asked Questions

What is included in this A2 rifle stock completion kit?

The kit contains the components needed to mount the buttstock of your choice on an AR-15 rifle. The description specifically notes that the A2 kit adds the correct buttstock spacer required for A2 rifle stocks, and that installation instructions are included.

Will this kit fit my AR-15 lower receiver?

The listed fit is for standard, mil-spec AR-15/M16/M4 lower receivers and clones. If your rifle is outside that specification, compatibility is not stated in the product data.

Is this kit intended for fixed rifle stock conversions?

Yes. The long description says it is perfect for stock conversions, including altering a rifle to accept a fixed rifle stock.

What materials are listed for the parts in this kit?

The receiver extension and A2 stock spacer are listed as aluminum with an anodized matte black finish. The recoil buffer is listed as aluminum and steel. The spring, lock ring, and receiver plate are listed as steel.

Does the product data specify which buttstock models this kit works with?

No. The product data says it is for mounting the buttstock of your choice and notes the A2 spacer for A2 rifle stocks, but it does not list specific buttstock models beyond that.