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AT3™ .75" (3/4") Low Profile Long Gas Block - Steel

AT3™ .75″ (3/4″) Low Profile Long Gas Block – Steel

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Lifetime WarrantyOn All AT3 Brand Products

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

This includes AT3 Red Dot Sights, Handguards, Iron 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.

Fast & Free Shipping On orders over $50

You will receive fast, free shipping for all orders over $50

Shipping cost is $7.99 for orders under $50. We ship with UPS or USPS, depending on the item.

Most orders received by 1pm CST ship the same day

You will receive an email with tracking information at the time of shipment. To expedite shipping, we may ship your order from multiple warehouses. Orders placed on weekends, holidays, or after 1pm will ship the following business day.

The AT3 Long Low Profile Gas Block is designed to cover up barrel scars that are left after removing an AR-15 front sight base


  • 3/4″ (.75″) size – works with any .75″ AR-15 barrel
  • Perfect for use with long AR15 handguards that cover the gas block
  • Length is designed to cover up blemishes on barrel after removing front sight base
  • Secured with 3 set screws (screws, allen wrench and roll pin included)
  • Backed by the Lifetime AT3 Warranty


  • Material: 4150 steel
  • Finish: Phosphate coating (matte black)
  • Length: see pictures
  • Inside Diameter: .75″
  • Weight: 2.7oz
  • Packaging: PE Bag
Frequently asked questions:
Q: How can I tell what size of gas block I need?
A: The gas block size is based on the outside diameter of your barrel. The most common size is .75″ (this is the military standard). If you aren’t sure – use calipers to measure the diameter of the barrel, in the area where the gas block sits. Or alternatively, you can try looking up the make and model of your rifle online for more details.


Q: How do I know if this gas block will fit under my handguard?
A: Our micro gas blocks are as small as you will find on the market. They are guaranteed to work with our AT3 handguards, and they should be compatible with all the other handguards out there!

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Customer Reviews

Based on 28 reviews
Gas block

Can’t say anything negative about it. It just works great and easy installation.

Gas Block

Great price easy install very satisfied with product

Thank you for the feedback Tommy! We appreciate it
Gas block

Gas block was great, the gas tube pin was not had to use a pin I already had to secure gas tube.

Thank you for the feedback, Roger. We're investigating these pins a little closer and considering a change.
Great product, quick delivery

I needed this gas block to complete my latest build. I removed the front iron sight, but I wanted to cover up the pin holes in the barrel. Shipping was faster than it I thought it would arrive. The description was perfect. Went right on the barrel and worked exactly as I had expected. Thanks!

Thank you for the feedback, Chris!
Good product

Finish on it seems like it might wear down easily. Pins didn't fit, but they sent me new ones that worked fine. I would suggest they send the better pins first not the cheap ones with coating that gets it the way of the pressed fit. They got me new pins though so can't complain and the length should be about another 1/16 to 1/8 inch long to cover all the bare metal on the barrel that is showing from removal of front sight post. Everything else i am pleased with and great product. Exceptional customer service as well! Thanks AT3!

We are sorry to hear this didn't match what you were really looking for. If you are still not pleased with the length we could do an exchange for the long gas block.