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AT3 Tactical Long Low-Profile Gas Block - Steel, .750 Diameter

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 31 reviews
Great Fit

Bought this to replace a cut down A2 gas block sight post. Fit's under my 1.300 ID rail on my lightweight build. The A2 block would have fit under a 1.500 ID rail, but I wanted something thinner. Also it's made of 4150 steel and the other ones I found were 4140 or didn't say what they were made of.

Thanks for sharing your feedback, John. We're glad you're satisfied with your purchase. Cheers!
Hand guard and low profile gas block

The hand guard is very smooth, extremely impressed with the machining. Parts installed easier than expected, and is solid. Gas block works, no issues.

Thanks for sharing your feedback, Anthony. We're glad you're satisfied with your purchase. Cheers!
Great price and perfect fit

Long gas blocks are hard to find. This one is made well and I like that it has 3 set screws for extra secure mounting. The only improvement would be a nitride finish, but that's just splitting hairs. If you need to cover FSB scars this is the perfect choice.

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