Anvil 057: MP 18 After Action Report

Published on September 16, 2020
Duration: 56:50

This guide details the assembly and function check of a semi-automatic conversion of the MP 18,I, led by expert gunsmith Mark Novak. It covers part identification, hardware sorting, trigger housing and sear assembly, front-end component installation, recoil spring setup, and crucial dry and live-fire function checks. Novak's deep understanding of mechanical physics and custom component manufacturing is evident throughout the process.

Quick Summary

Expert gunsmith Mark Novak demonstrates the intricate assembly of an MP 18,I semi-automatic firearm conversion. The process involves detailed parts identification, precise trigger housing and sear assembly, and tuning the bolt mass and recoil spring for controlled cyclic rates, culminating in crucial dry and live-fire function checks for safety and reliability.

Chapters

  1. 00:15Parts Identification
  2. 02:44Sorting Hardware
  3. 05:11Trigger Housing and Sear Assembly
  4. 08:06Rear Sight and Front End Components
  5. 12:24Rate of Fire Physics
  6. 15:53Final Assembly and Function Check
  7. 17:17Live Fire Testing

Frequently Asked Questions

How is the MP 18,I converted to semi-automatic fire?

The MP 18,I is converted to semi-automatic by modifying its original open-bolt system to a closed-bolt operation. This involves careful tuning of the bolt mass, recoil spring, and ensuring the sear reliably catches the bolt after each shot, preventing continuous firing.

What are the key steps in assembling the MP 18,I semi-auto conversion?

Key steps include identifying and sorting parts, assembling the trigger housing and sear mechanism, installing front-end components like the barrel and shroud, fitting the recoil spring with its interrupted thread cap, and performing critical dry and live-fire function checks.

What physics principles are relevant to the MP 18,I's cyclic rate?

The cyclic rate is governed by principles of oscillation and mass-spring systems. Reducing the mass or altering the spring tension, similar to adjusting a pendulum's frequency, directly impacts how fast the firearm can cycle, requiring precise tuning for semi-automatic control.

What safety precautions are essential when testing a converted firearm like the MP 18,I?

Essential safety precautions include ensuring the firearm is unloaded during assembly, performing thorough dry function checks, and during live fire, starting with a minimal round count (e.g., three) to verify safe semi-automatic operation and prevent uncontrolled firing.

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