Disassembling the Bizarre Terni Model 1921

Published on February 16, 2026
Duration: 1:07

This guide details the disassembly of the unique Terni Model 1921, as demonstrated by Ian McCollum. It covers the removal of the buttstock and trigger guard, analysis of the trigger mechanism including its semi-auto disconnector and potential full-auto capability, and the detachment of the front-end assembly featuring an integrated bayonet and monopod. The process highlights the firearm's intricate design and potential for missing components in historical examples.

Quick Summary

The Terni Model 1921 is disassembled by first removing the trigger guard and buttstock via two screws. Its trigger mechanism features a semi-automatic disconnector, with a noted missing part for full-auto capability. The front end assembly, including a monopod and bayonet mount, is detached by removing a single screw.

Chapters

  1. 00:00Buttstock and Trigger Guard Removal
  2. 00:24Trigger Mechanism Analysis
  3. 00:42Front End and Monopod Disassembly

Frequently Asked Questions

How is the buttstock and trigger guard removed from the Terni Model 1921?

The buttstock and trigger guard assembly of the Terni Model 1921 are removed by unscrewing two specific screws. This process reveals the internal structure, including spacer tubes that help hold the screws in place.

What is notable about the trigger mechanism of the Terni Model 1921?

The Terni Model 1921 features a semi-automatic disconnector. Ian McCollum notes a missing component that would have allowed a full-auto lever to disable this disconnector, indicating potential for full-auto fire.

How is the bayonet and monopod assembly detached from the Terni Model 1921?

To detach the bayonet and monopod assembly on the Terni Model 1921, a single screw at the front end of the firearm needs to be removed. This assembly includes the nose cap and a specialized muzzle support bracket.

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