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AK-Builder Bulgarian-style center support sleeve and rivet for 1mm receivers, heat treated alloy steel.
AK Center Support for 1mm Receivers
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$700
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AK Center Support for 1mm Receivers

A1-31
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Description

AK-Builder Center Support & Rivet — Bulgarian-Style (No Flat)

Modern, builder-proven center support set patterned after Bulgarian receivers. The sleeve is round (no flat) by design for correct mag-well clearance, machined from alloy steel and heat treated for strength and long service life.

What it is

  • Bulgarian-style round sleeve (no flat), alloy steel, heat treated.
  • Matching center support rivet.

Why no flat?

Some countries used a larger-diameter sleeve with a flat for magazine clearance. This set follows the Bulgarian pattern, which uses a round sleeve (no flat).

Made to work together for best results

The sleeve and rivet are designed as a pair to deliver consistent forming and a clean finished head.

Typical formed head size (for reference)

  • Diameter: 0.225" (≈ 5.72 mm)
  • Height: 0.065" (≈ 1.65 mm)

Installation notes

For best results and to avoid rail crushing, install with a proper long-rivet/center-support jig that drives force straight through the rivet.

Includes

  • (1) Center support sleeve (round, no flat, alloy steel, heat treated).
  • (1) Center support rivet.


Center support assembly example
Formed head size after installation
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