Faxon Firearms Ultra Low-Profile AR 15 Gas Block – .625 or .750 Diameter

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Tight Fit and Light Weight – Perfect Gas Block for Featherweight AR15s

These ultra-low profile gas blocks are made from high-strength steel and works fully with any rail system. The perfect partner for Faxon Firearms or any other barrels with a standard diameter gas journal. Lightweight and very easy to install – includes triple locking set screws to make sure it stays intact.

Note: We recommend the use of Loc-Tite on each set screw to ensure your gas system will stay secure with use.


Barrel Compatibility: .625″ / .750″
Weight: .07 Lbs
Width: 1.00″
Height: ~1 & 7/32″
Mounting: 3x Screws (Allen Key interface)

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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.

Faxon Firearms Warranty

We do understand that life happens and that often a purchase will need to be returned. Customers may return any product, for any reason, in line with the requirements & policies below.

For any errors on Faxon’s part, after notification from the customer, Faxon will dispatch a Fed-Ex Ground label for the return of the product. Upon receipt and inspection at Faxon, a replacement will be sent to the customer via Fed-Ex Ground with tracking information sent to the customer.


  • Faxon will only refund products purchased directly through Faxon Firearms.
  • If you purchased a product through one of Faxon’s authorized dealers and would like to return the product for a refund, you must contact the dealer for your refund.
  • Merchandise must be in new condition with original packaging
  • Merchandise must be return-shipped in a protective box
  • A full refund including shipping if the return resulted from our error, otherwise we will deduct the shipping costs from the refund.
  • All product replacements done under warranty can be handled by Faxon directly.
  • The customer will receive a refund within 10 business days of our receiving your return. The refund issued in the same form of payment used for purchase.
  • No return will be granted for a product that is modified in any way
  • No returns for refund after 30 days from the delivery date of the product.
  • There will be a 15% restocking fee on all returns.

Disclaimer: Manufacturer’s warranty is subject to change without prior notice.

Customer Reviews

Based on 9 reviews
Carl Chaney


Thank you for your feedback! We're glad to hear that you're happy with the Faxon Firearms Ultra Low-Profile AR 15 Gas Block - .625 or .750 Diameter.

Randy Spoon
Faxon .625 gas block

Looks great with the Faxon GUNNER barrel. Fit up was snug and the 3 set screws make for a secure lockup. Still waiting to complete the gun but so far everything fits great.

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

Chance Brown
Great little block

It performs flawlessly, just make sure that you buy a Faxon Firearms gas tube or make sure the gas tube you buy has the gas block pin. Faxon doesn’t include the pin with the gas block. I had to order a pin and wait an extra week. That’s the only reason I’m putting 4 stars

lisa evak
gas block

well made but really needs to be drilled for a pin for real world strenght

S Carter

I recently purchased a Faxon pencil profile barrel for my wwsd build and needed a .625 gas block because all I had was .750’s so I ordered the Faxon ultra low profile block and when it arrived I was very impressed. Now I have used Aero precision , Yankee Hill machine and they were great! I just want to say that this is just a shade more polished and with the cut out sides it’s only going to be lighter, so that is the ultimate goal right? I couldn’t be more satisfied with this item. Thank you so much,AT3!

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