Lube or Grease an AR? | BUILD BOX Bonus

Published on November 19, 2024
Duration: 4:48

This guide details the proper lubrication and installation of an AR-15 barrel and barrel nut, emphasizing the use of anti-seize or grease on critical mating surfaces to prevent binding and ensure proper fit. It also covers the strategic application of red and blue Loctite for securing gas blocks and handguards, respectively, highlighting the importance of heat for red Loctite removal.

Quick Summary

For AR-15 builds, use grease or anti-seize on the barrel extension and its shoulder when mating dissimilar metals like steel and aluminum. This prevents binding and ensures proper torque. Red Loctite is for permanent gas block screws (requires heat), while blue Loctite is for removable handguard set screws.

Chapters

  1. 00:03Introduction to Lubrication and Loctite
  2. 00:14Understanding Red vs. Blue Loctite
  3. 00:41Grease for Fitting Parts (Barrel & Upper Receiver)
  4. 01:53Lubricating Barrel Extension Shoulder
  5. 02:24Lubricating Barrel Nut Threads
  6. 03:05Torquing the Barrel Nut
  7. 03:35When to Use Loctite
  8. 03:45Red Loctite for Gas Block Screws
  9. 04:02Blue Loctite for Handguard Set Screws
  10. 04:13Conclusion: Time and Place for Everything

Frequently Asked Questions

When should I use grease or anti-seize when installing an AR-15 barrel?

Grease or anti-seize is crucial when fitting dissimilar metals like a steel barrel and aluminum upper receiver. Apply it to the barrel extension and its shoulder to prevent binding, ensure proper torque, and facilitate future disassembly.

What is the difference between red and blue Loctite for AR-15 builds?

Red Loctite is a permanent threadlocker requiring heat for removal, ideal for gas block screws. Blue Loctite is a medium-strength, removable threadlocker suitable for handguard set screws and other fasteners that may need future adjustment.

How tight should an AR-15 barrel nut be torqued?

AR-15 barrel nuts are typically torqued between 40 and 80 foot-pounds. Always consult your specific upper receiver and barrel nut manufacturer's torque specifications to ensure proper installation.

Why is lubrication important on AR-15 barrel nut threads?

Lubricating the barrel nut threads ensures it can be torqued accurately without binding. This is especially important when dealing with multiple metal types, preventing stress on the upper receiver and ensuring a secure barrel fit.

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