From the Vault: The SIG 551-A1

Published on March 5, 2018
Duration: 5:22

This video provides a detailed look at the SIG 551-A1, highlighting its AK-like operation with unique features such as a sealed receiver, ambidextrous safety, and a diopter peep sight. The presenter demonstrates its disassembly, emphasizing the long-stroke gas piston system and the recoil spring's placement around the piston, which allows for a folding stock. The unique translucent magazines with linking capabilities are also showcased.

Quick Summary

The SIG 551-A1 is a semi-automatic rifle with AK-like operating principles, featuring a sealed receiver, ambidextrous safety, diopter peep sights, and translucent linking magazines. Its recoil spring is housed around the piston, allowing for a folding stock and an adjustable gas system.

Chapters

  1. 00:13Introduction to SIG 551-A1
  2. 00:45External Features Overview
  3. 01:01Ambidextrous Safety & Sights
  4. 01:32Adjustable Gas System
  5. 01:41Folding Stock Mechanism
  6. 01:59Magazine Features
  7. 02:31Charging and Bolt Hold-Open
  8. 02:53Disassembly - Lower Receiver
  9. 03:19Disassembly - Bolt Carrier Group
  10. 03:58Disassembly - Handguards
  11. 04:28Disassembly - Gas System
  12. 04:56Disassembly - Gas Piston
  13. 05:04Final Field Strip
  14. 05:09Conclusion

Frequently Asked Questions

What makes the SIG 551-A1 similar to an AK-47?

The SIG 551-A1 shares AK-like operating principles, including a similar charging handle mechanism and a long-stroke gas piston system. This design contributes to its robust and reliable functionality, often drawing comparisons to the AK platform.

What are the unique features of the SIG 551-A1 compared to other semi-automatic rifles?

The SIG 551-A1 boasts a sealed receiver for better element protection, an ambidextrous safety selector, a diopter peep sight system, and translucent magazines that can link together. Its recoil spring is also integrated around the piston, enabling a folding stock.

How does the SIG 551-A1's magazine system work?

The SIG 551-A1 uses translucent magazines that have built-in attachments. These allow multiple magazines to be connected side-by-side, similar to the G36 system, facilitating quicker reloads by having extra rounds readily available.

Can the SIG 551-A1's bolt be held open?

Yes, the SIG 551-A1 features a bolt hold-open mechanism. When the last round is fired, the bolt will lock to the rear, and the hold-open lever is easily accessible for releasing the bolt when a new magazine is inserted.

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