SIG 550 / Stgw 90: The Swiss Kalashnikov

Published on July 4, 2022
Duration: 15:40

This guide details the field stripping process for the SIG 550 / Stgw 90, often called the 'Swiss Kalashnikov.' Expert Ian McCollum demonstrates how to break down the rifle into its primary components, highlighting its internal similarities to the AK-47 design. The process involves removing the receiver pin, then separating the bolt carrier group, recoil spring, and gas tube. Proper safety protocols are emphasized throughout.

Quick Summary

The SIG 550 / Stgw 90, nicknamed the 'Swiss Kalashnikov,' features an AK-inspired gas-operated rotating bolt system and high Swiss manufacturing quality. It uses 5.56x45mm NATO, has a four-position selector, and unique magazine coupling. Field stripping involves separating receivers and removing the bolt carrier, recoil spring, and gas tube.

Chapters

  1. 00:00Introduction to the SIG 550
  2. 01:12Development History
  3. 03:56External Features and Markings
  4. 05:00Magazines and Controls
  5. 08:43Internal Mechanics and Disassembly
  6. 12:23Gas System and Recoil Spring
  7. 13:45Swiss Military Adoption

Frequently Asked Questions

What is the SIG 550 / Stgw 90 often called and why?

The SIG 550 / Stgw 90 is frequently referred to as the 'Swiss Kalashnikov' due to its internal design similarities to the AK-47, particularly its gas-operated rotating bolt system, while maintaining high Swiss manufacturing standards.

What are the key features of the SIG 550 / Stgw 90?

Key features include its AK-inspired gas-operated rotating bolt action, a four-position selector switch (safe, semi, 3-round burst, full-auto), translucent 20 or 30-round magazines with coupling lugs, and an HK-style diopter sight system.

How is the SIG 550 / Stgw 90 field stripped?

Field stripping involves removing the rear receiver pin to separate the upper and lower receivers, followed by removing the bolt carrier group, recoil spring assembly, and gas tube from the barrel assembly.

What caliber does the SIG 550 / Stgw 90 use?

The SIG 550 / Stgw 90 is chambered in 5.56x45mm NATO, also known as 5.6mm Gw Pat 90 in Swiss military designation, a standard intermediate rifle cartridge.

More Gunsmithing & DIY Videos You Might Like

More from Forgotten Weapons

View all →