FN SCAR 17S - MK17 PART 1

Published on July 17, 2018
Duration: 45:31

This video provides a detailed look at the FN SCAR 17S (MK17), covering its history, design, and mechanical operation. It includes a comprehensive disassembly and reassembly guide, highlighting the external piston system, interchangeable barrel capability, and the challenges with proprietary magazines. The presenter, with apparent expertise, discusses the rifle's development for SOCOM and its advantages over previous platforms.

Quick Summary

The FN SCAR 17S (MK17) assault rifle was developed for SOCOM to address M4 carbine limitations. It features a 7.62x51mm NATO chambering, an external short-stroke gas piston system, and a cold hammer-forged barrel. A notable issue is optic durability due to harmonic vibrations, requiring specialized mounts. Proprietary magazines are expensive, but aftermarket lower receivers enable the use of standard SR-25 magazines.

Chapters

  1. 00:12Introduction to FN SCAR 17S
  2. 01:30SCAR Program History and SOCOM Requirements
  3. 02:53SCAR Light vs. SCAR Heavy
  4. 04:29FN SCAR 17 (MK17) Development
  5. 05:51SCAR Heavy's Role and Advantages
  6. 07:21FN SCAR 17S Overview
  7. 08:08External Features: Stock, Colors, Optics
  8. 09:22Optic Durability Issues on SCAR Heavy
  9. 10:27Upper Receiver and Barrel Removal
  10. 11:16Lower Receiver, Grip, and Safety
  11. 11:38Proprietary SCAR 17 Magazines
  12. 13:28H&R Defense Lower for SR-25 Magazines
  13. 17:30Cocking Handle and Rails
  14. 17:50Backup Sights and Barrel Specs
  15. 18:41Muzzle Brake and Gas System
  16. 19:03Disassembly: Lower Receiver and Stock
  17. 19:51Disassembly: Recoil Spring and Charging Handle
  18. 20:20Disassembly: Bolt Carrier Group
  19. 20:38SCAR Tool Kit Overview
  20. 21:00Disassembly: Firing Pin and Cam Pin
  21. 21:21Bolt and Carrier Assembly Details
  22. 22:13Disassembly: Gas System and Piston
  23. 23:35Short-Stroke Piston Design
  24. 24:24Gas Valve Functionality
  25. 24:52SCAR 17S Firing Impressions
  26. 25:30Ammunition Reliability
  27. 26:28Accuracy Observations
  28. 26:34Reassembly: Gas System and Piston
  29. 27:48Reassembly: Bolt Carrier Group
  30. 28:33Reassembly: Recoil Spring, Stock, Lower Receiver
  31. 29:04Function Check
  32. 29:23Optic Choice: Spectre DR
  33. 30:06Range Test: SCAR 17S Firing
  34. 30:11Magazine Testing: Standard vs. Aftermarket
  35. 36:54Magazine Downfalls and H&R Defense Solution
  36. 37:46Swapping to H&R Defense Lower
  37. 38:01Testing Various SR-25 Magazines
  38. 44:16Accuracy Results with Black Hills Ammo
  39. 45:06Comparison: H&R Defense Lower vs. Standard Trigger
  40. 45:17Conclusion

Frequently Asked Questions

What is the history behind the FN SCAR 17S?

The FN SCAR 17S (MK17) originated from a SOCOM requirement in the mid-2000s for a new assault rifle. This need arose due to issues with the M4 carbine and Colt's inability or unwillingness to implement necessary modifications, leading to a competition won by FN.

What are the main differences between the SCAR-Light and SCAR-Heavy?

The SCAR-Light was chambered in 5.56mm and was intended for trials, but faced significant production issues and was eventually dropped. The SCAR-Heavy, chambered in 7.62x51mm NATO, was designed to replace multiple existing 7.62mm platforms and proved more successful.

What are the common issues with optics on the FN SCAR 17S?

The SCAR 17S is known to have harmonic vibrations that can destroy standard optics over time. This requires users to select 'SCAR-rated' optics or use specialized mounts with buffer systems to mitigate the issue.

Can the FN SCAR 17S use standard AR-10 magazines?

By default, the SCAR 17S uses proprietary FN magazines, which are expensive and scarce. However, aftermarket lower receivers, such as those from H&R Defense, are available that allow the rifle to accept standard SR-25/AR-10 pattern magazines.

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