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AK Center Support for 1mm Receivers

CODE:

A1-31

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

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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.

AK Center Support for 1mm Receivers with Bulgarian Rivet

0.0

CODE:

B3-71

These are original Bulgarian rivets. They measure 1.590".Comes with US made sleeve. May not form as large of a head as our rivets we had in the past.

$7⁵⁰

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AK-Builder riveting press, black-finished, showing main unit, assorted dies and supports.

AK-Builder Rivet Tool

(Reviews: 1)

CODE:

T5-11

The AK-Builder Riveting Tool is the proven standard for precision AK builds. It installs front and rear trunnion rivets, center supports, and scope rails with perfect alignment and professional results — crafted from heat-treated 4140 steel and trusted by builders worldwide. (Does not install trigger guard rivets.)

$270⁰⁰

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5/32" .1563" Screw Machine Drill Bit

0.0

CODE:

C1-72

These are the same drills I use in the Rivet Drilling tool, drilling gas piston rivet holes and for drilling holes for the 4mm rivet holes in receivers. These are screw machine length drill bits with 135 degree split points to keep drill walk and bending to a minimum. The junk drills from...

$2⁹⁵

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