Colt AR-15A2 SPII and AR-15A2 Series, Part 2

Published on February 2, 2020
Duration: 11:19

This video provides a detailed historical overview and technical breakdown of Colt's AR-15A2 series firearms, released between 1984 and 1988. It highlights the evolution from the SP1 models, incorporating changes from the M16A2, such as updated stocks, pistol grips, barrels with a 1 in 7 twist rate, and the introduction of features like the forward assist and case deflector. The series covers various models including the R6400, R6401, R6500, R6420 carbine, the HBAR R6000, the 9mm carbine R6540, and the R6520 government carbine, detailing their specific modifications and market positioning.

Quick Summary

The Colt AR-15A2 series, evolving from the SP1, began incorporating M16A2 features around 1984-1985. Key upgrades included an A2 stock and grip, a 1 in 7-inch twist government profile barrel for the M855 SS109 cartridge, a Delta ring, and new handguards. Later models added a forward assist and case deflector, with the R6500 being the last to feature M16A1-style sights on a full-size rifle.

Chapters

  1. 00:07Introduction to Colt AR-15A2 Series Part 2
  2. 00:33SP1 Drop and M16A2 Influence
  3. 00:50Colt R6400: Early AR-15A2
  4. 01:11Stock and Grip Changes
  5. 01:28Barrel and Twist Rate Evolution
  6. 01:51Delta Ring and Handguards
  7. 02:02Colt R6401: Introduction of Forward Assist
  8. 02:26Colt R6500: Case Deflector and Sights
  9. 03:05Colt R6420 Carbine Evolution
  10. 03:17Carbine Stock and Receiver Changes
  11. 04:09Carbine Barrel and Handguard Specs
  12. 04:34Colt R6000 AR-15A2 HBAR
  13. 04:53HBAR Features and Barrel Design
  14. 05:36Colt R6540 9mm Carbine
  15. 05:539mm Carbine Market and Development
  16. 06:16Early 9mm Carbine Models
  17. 06:329mm Carbine Gas Block and Deflector
  18. 06:52Transitional 9mm Carbine Receivers
  19. 07:07LE 6540 and Pin Changes
  20. 07:30Discontinuation of Sporter II Carbine
  21. 07:34Colt R6520 AR-15A2 Government Carbine
  22. 07:57R6520 Upper Receiver and Sights
  23. 08:06R6520 Law Enforcement Model
  24. 08:38AR-15A2 Government Rifle (1988)
  25. 08:59Government Rifle vs. HBAR
  26. 09:07Civilian M16A2 Equivalent
  27. 09:21Export and Other Models
  28. 09:29AR-15A2 Series Timeline and Commercial Sales Pull
  29. 09:58Gradual Part Evolution in Colt Series
  30. 10:12Upper Receiver Evolution Example (R6420)
  31. 10:29Stock Evolution Example
  32. 10:48Lower Receiver Consistency
  33. 11:08Conclusion and Next Video Preview

Frequently Asked Questions

What were the key changes from the Colt SP1 to the AR-15A2 series?

The Colt AR-15A2 series, starting around 1984-1985, incorporated changes from the M16A2. These included an A2-style stock and pistol grip, a government profile barrel with a 1 in 7-inch twist rate for the M855 SS109 cartridge, a Delta ring, and new interchangeable handguards. Later models also added a forward assist and a case deflector.

What is the significance of the Colt R6500 model?

The Colt R6500 was an AR-15A2 Sporter II that introduced the fired cartridge case deflector. Notably, it was the last full-size Colt rifle to feature M16A1-style field sights before the adoption of fully adjustable M16A2-style sights on subsequent models.

When did Colt stop commercial sales of the AR-15 and why?

Colt's Industries voluntarily pulled the AR-15 from commercial sales in 1990. This decision was made due to government pressure, which led to the subsequent introduction of the Colt Sporter series as a replacement.

What were the main differences between the Colt AR-15A2 HBAR R6000 and the Government Rifle?

The Colt AR-15A2 HBAR R6000, introduced in 1985, was the first commercial rifle with an M16A2 upper receiver and adjustable sights, but it had a slab-side lower. The AR-15A2 Government Rifle, introduced in 1988, was similar but featured a government profile barrel and was considered the closest civilian equivalent to the M16A2.

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