Semiauto Open-Bolt MAC-10 (They Made More than 100,000 of These)

Published on December 26, 2025
Duration: 13:46

This review details the RPB Semiauto M10 SAP, an open-bolt pistol developed as a cheaper alternative to the full-auto MAC-10. It highlights the firearm's simple blowback operation, unique RPB 'Cobra' logo, and the ATF's 1982 ruling that reclassified such designs, leading to production cessation. The video also contrasts the semi-auto trigger group with its full-auto counterpart, noting the ease of conversion.

Quick Summary

The RPB Semiauto M10 SAP was an open-bolt, semi-automatic pistol produced by RPB Industries. Approximately 125,000 units were made before ATF Ruling 82-2 in 1982 reclassified such firearms as machine guns, leading to production cessation.

Chapters

  1. 00:00History of RPB and the Semiauto M10
  2. 02:33Physical Overview and Markings
  3. 03:59Mechanical Operation
  4. 05:06Disassembly and Internals
  5. 06:03Trigger Group Comparison
  6. 09:13Production and ATF Ruling

Frequently Asked Questions

What was the RPB M10 SAP?

The RPB M10 SAP was an open-bolt, semi-automatic variant of the MAC-10 pistol, produced by RPB Industries as a more affordable alternative to the full-auto version. It operated via a simple blowback action.

Why was the RPB M10 SAP significant?

Its significance lies in its history as one of the firearms affected by ATF Ruling 82-2, which reclassified open-bolt semi-autos as machine guns. RPB produced around 125,000 units before this ruling impacted production.

How did the semi-auto M10 SAP differ mechanically from the full-auto version?

The semi-auto M10 SAP used a modified trigger group with a permanent disconnector and a specific reset mechanism to prevent full-auto fire. However, it was known to be relatively easy to convert.

What happened to RPB Industries after ATF Ruling 82-2?

Following ATF Ruling 82-2 in 1982, which reclassified open-bolt semi-automatic firearms, RPB Industries ceased production. The company later closed, and production shifted to closed-bolt designs under SWD.

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