Product Spotlight: Brownells BRN-180 13.9" & 14.5" Uppers

Published on August 31, 2023
Duration: 12:02

This video details the Brownells BRN-180 upper receiver in 13.9" and 14.5" barrel lengths, focusing on how to legally configure them for use with a stock. It explains the necessity of pinning and welding muzzle devices to achieve a minimum barrel length of 16 inches, discussing various muzzle device options and the required lengths for different barrel configurations.

Quick Summary

To legally configure a 13.9-inch Brownells BRN-180 upper with a stock, a muzzle device must be pinned and welded to achieve a minimum barrel length of 16.1 inches. This typically requires a muzzle device and any spacers to total approximately 2.7 inches in length, as the threaded portion of the barrel is about 0.6 inches.

Chapters

  1. 00:00Introduction: BRN-180 Uppers
  2. 00:21BRN-180 13.9" vs 14.5" Barrels
  3. 01:00Why Shorter Barrels?
  4. 01:22Pinning & Welding for Legal Length
  5. 02:0213.9" Barrel Performance
  6. 02:26Muzzle Device Requirements
  7. 02:5113.9" Barrel: 2.7" Muzzle Device Length
  8. 03:19Thread Length Explanation
  9. 04:27Muzzle Devices You CAN Use
  10. 04:30Forward Control Designs Options
  11. 05:24Smith Enterprise Muzzle Device
  12. 05:43Midwest Industries Blast Can
  13. 06:05SureFire Muzzle Devices
  14. 06:46Precision Armament Options
  15. 07:49VG6 Precision Muzzle Device
  16. 08:25Using Spacers (Lock Nuts/Shims)
  17. 09:3914.5" Barrel: 2.1" Muzzle Device Length
  18. 10:1913.9" vs 14.5" Barrel Preference
  19. 10:31BRN-180 Gen 2 Features
  20. 10:36Two-Position Gas Block
  21. 10:53Operating the BRN-180
  22. 11:00Example Build Configuration
  23. 11:25Conclusion: BRN-180 Uppers

Frequently Asked Questions

What is the minimum muzzle device length needed for a 13.9-inch BRN-180 upper to be legally configured with a stock?

To legally use a stock with a 13.9-inch BRN-180 upper, a muzzle device must be pinned and welded to achieve a total barrel length of at least 16.1 inches. This typically requires a muzzle device and any necessary spacers to total approximately 2.7 inches in length.

How does the threaded length of a muzzle affect pin and weld calculations for AR-15 barrels?

The threaded portion of an AR-15 barrel, from the muzzle to the shoulder where the muzzle device seats, is typically around 0.6 inches. This length must be accounted for when calculating the total length needed for a pin and weld, as the muzzle device threads onto this portion.

What are recommended muzzle devices for a 13.9-inch BRN-180 upper that needs to be pinned and welded?

Recommended muzzle devices include the Forward Control Designs flash hider/compensator (2.7 inches), Midwest Industries blast cans, certain SureFire muzzle devices, and Precision Armament options, often requiring spacers like lock nuts or shims to reach the necessary 2.7-inch total length.

Why are flash hiders or compensators often preferred over muzzle brakes for short-barreled AR-15s like the BRN-180?

Flash hiders or compensators are generally preferred for short barrels to reduce muzzle blast and concussion. Muzzle brakes can create excessive noise and blast, making them less desirable for shooters in close proximity, such as on a public range.

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