AR15 Barrel to Upper assembly ~ Keep it simple and inexpensive!

Published on August 23, 2018
Duration: 26:31

This guide details the process of assembling an AR-15 barrel to the upper receiver, focusing on simplicity and cost-effectiveness. It covers essential tools, cleaning procedures, barrel nut torque considerations, and the installation of the front sight, gas tube, and flash hider. The instructor emphasizes practical techniques over expensive specialized tools, offering advice on achieving proper torque and alignment for a reliable build.

Quick Summary

Assembling an AR-15 barrel to the upper receiver requires specific tools like a barrel vise, alignment tool, and torque wrench. Clean components with mineral spirits, apply anti-seize lubricant to threads, and ensure proper alignment of the gas tube passageway when tightening the barrel nut, typically between 30-80 ft-lbs. Never pre-crush the crush washer for the flash hider.

Chapters

  1. 00:03Introduction and Project Goal
  2. 00:13Previous Rifle Configuration
  3. 00:59Required Parts for Assembly
  4. 01:37Philosophy: Simplify and Reduce Cost
  5. 01:52Essential Tools for Assembly
  6. 02:21AR-15 Barrel Vise and Alignment Tool
  7. 02:47Barrel and Gas Tube Components
  8. 03:01Front Sight and Flash Hider Assembly
  9. 03:10Handguard Assembly Plate
  10. 03:14Needle Nose Pliers and Cleaning Supplies
  11. 03:49Barrel Wrench and Torque Distribution
  12. 04:03Pin Punches and Roll Pins
  13. 04:31Colt Tapered Pins
  14. 04:51Light Hammer
  15. 05:08Initial Cleaning of New Parts
  16. 05:38Securing the Upper Receiver in Vise
  17. 06:03Positioning the Vise Block
  18. 06:41Chuck Vise Block into Vise
  19. 07:15Inserting Barrel Extension
  20. 07:31Applying Anti-Seize Lubricant
  21. 08:05Sliding on the Delta Ring Assembly
  22. 09:18Initial Tightening of Delta Ring
  23. 09:36Using Breaker Bar for Initial Torque
  24. 10:13Aligning the Gas Tube Passageway
  25. 11:08Using Breaker Bar for Alignment
  26. 11:37Using Torque Wrench for Certification
  27. 12:25Backing Out Alignment Pin
  28. 13:04Cleaning Excess Anti-Seize Lubricant
  29. 13:35Discussion on Barrel Nut Torque
  30. 14:24Importance of Gas Tube Alignment
  31. 15:40Historical Torque Application
  32. 16:26Positioning the Barrel Wrench
  33. 16:55Mounting Front Sight and Flash Hider
  34. 17:07Positioning the Gas Tube
  35. 17:56Installing the Handguard Plate
  36. 18:14Sliding on the Front Sight
  37. 18:28Securing Assembly in Vise
  38. 19:04Optional: Thread Locker on Pins
  39. 19:39Driving Front Sight Pins
  40. 20:20Mounting the Gas Tube Pin
  41. 21:51Installing the Flash Hider and Crush Washer
  42. 22:19Applying Anti-Seize to Crush Washer
  43. 22:37Correct Crush Washer Installation
  44. 22:57Using Thin Profile Open End Wrench
  45. 23:10Witness Marks and Tightening
  46. 24:22Watching for Gap Closure
  47. 25:20Historical Context: Delta Ring
  48. 25:37Modern Delta Ring Tools vs. Manual Method
  49. 26:21Conclusion and Call to Action

Frequently Asked Questions

What are the essential tools for assembling an AR-15 barrel to the upper receiver?

Essential tools include an AR-15 barrel vise with an insert sleeve and alignment tool, a barrel wrench, pin punches, a light hammer, needle-nose pliers, anti-seize lubricant, mineral spirits for cleaning, a breaker bar, and a torque wrench. A thin-profile open-end wrench is needed for the flash hider.

How much torque is needed for an AR-15 barrel nut?

The recommended torque range for an AR-15 barrel nut is 30 to 80 foot-pounds. However, the critical factor is ensuring the gas tube passageway aligns correctly, which can often be achieved by feel with a breaker bar, rather than strictly adhering to a torque number.

Should I pre-crush the crush washer when installing an AR-15 flash hider?

No, you should never pre-crush the crush washer. It is installed with the broad side facing the flash hider and is tightened to create a seal. The correct tightening process typically involves 1.5 to 1.75 turns after initial contact, ensuring the gap between the barrel and washer closes.

What is the purpose of anti-seize lubricant in AR-15 barrel assembly?

Anti-seize lubricant is applied to barrel threads and crush washers to prevent thread seizure and galling. This ensures accurate torque application during assembly and makes future disassembly much easier, protecting the components.

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