AT3™ Aeroshell 64/33MS Grease for AR-15 Barrel Nut – 1/2 Ounce Jar


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Mil-Spec Aeroshell 64 / 33MS Barrel Nut Grease from AT3

Aeroshell 64 (formerly 33MS) stands as the high-pressure grease trusted by the US military for attaching barrel nuts to M16 and AR-15 receivers. This lithium-based grease acts as a barrier between steel and aluminum, preventing corrosion and binding on your rifle over time. And if you’re a frequent builder, not only is this a must for your workbench, but a single 1/2 ounce jar covers multiple builds!

How to Use Aeroshell on Your Barrel Nut

One of the great things about Aeroshell, is that you don’t need to use a lot to get the benefits. Using a small amount of grease (think pea-sized), work the grease into the threads of your upper receiver. Then, thread on your barrel nut until tight. Remove and install the barrel nut a few times to work in the grease before putting on final torque. Simple!


  • Approved for MIL-G-21164D for M16 and M4 rifle barrel nut grease
  • Prevents galvanic corrosion between aluminum receiver and steel barrel nut
  • 1/2 ounce jar can be used for multiple builds


Have Questions About this Product?

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

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All AT3 Tactical Brand Products carry a lifetime warranty against manufacturer’s defects.

This includes AT3 Red Dot SightsHandguardsIron Sights, and any other product that carries the “AT3 Tactical” or “AT3™” name. For other brands (ex. Magpul or Troy), please refer to the manufacturer’s warranty policy.

In the event that your AT3™ product becomes unusable, we will repair or replace the product at no charge to you.

If we cannot repair your product, we will replace it with a product in perfect working order of equal or better physical condition. The warranty is fully transferable, but we may require information about the original purchase to validate the authenticity of the product.

If your product is in need of warranty service, please contact AT3 Tactical to start the process

Our contact info is available here. To expedite processing, please provide your order information and description of the defect.

Please note: The AT3 Lifetime Warranty does not cover loss, theft, intentional damage or cosmetic damage that doesn’t affect the performance of the product.

Customer Reviews

Based on 1 review
Aeroshell 64/33MS Grease

Works well, does what it supposed
To do which is provide lubrication
And stopped parts binding, like it
And would recommend it.

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.