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AT3™ Low Profile Micro Steel Gas Block - 4 Sizes Available

AT3™ Low Profile Micro Steel Gas Block – 4 Sizes Available


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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.

This premium Steel Micro Gas Block comes in 4 sizes: .625″, .75″, .875″, and .936″.

We have a fit for every barrel!


  • 4 sizes available: .625″, .75″, .825″, and .936 (.75″ is the most common size, but always measure the barrel if you aren’t sure!)
  • Low profile design, perfect with our free floating handguard
  • Steel construction (better than aluminum for withstanding extreme temperatures)
  • Secured using 2 set screws (screws, allen wrench and roll pin included)
  • Backed by the AT3 Lifetime Warranty


  • Material: 4150 Steel, Black Finish
  • Length: 1″
  • Height: Sits 3/8″ off of the barrel (fits under all free float handguards!)
  • Weight: 1.5-1.8oz depending on size
  • 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 59 reviews

Easy install. Fits perfect on my Ruger ar556 under an AT3 free float quad rail.

Thanks for sharing your feedback, Danny. We're glad you're satisfied with your purchase. Cheers!
Low profile gas block

Ordered a low profile gas block and quad rail.fits perfect and fast shipping

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

Great item at competitive price.

Thanks for sharing your feedback, Gregory. We're so glad you're satisfied with your purchase. Cheers!
Low Profile Gas Block

Perfect fit. Will buy again for next build.

Thanks for sharing your experience, Daniel. We're glad you're satisfied with your purchase. Cheers!
AT3 Micro Gas Block

Easily fit my 300 AAC Blackout barrel and AT3 7" quad rail. Excellent buy!

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

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