Christmas Sale | Up to 40% Off! Shop Now

AT3™ Low Profile Steel AR 15 Gas Block + Gas Tube + Roll Pin Combo

Out of Stock
Orders will Ship within 1 Business Day
Backed by the AT3 Lifetime Warranty!
TOP ADD-ON'S
AT3 Tactical Crush Washer - 1/2 Inch for 5.56/.223

AT3 1/2 Inch Crush Washer for .223/5.56 Muzzle Devices

$1.69
AT3™ AR-15 Gas Tube Roll Pins

AT3™ AR-15 Gas Tube Roll Pins – 2pcs

$0.84

Buy As A Set And Save!

This combo includes your choice of 4 different sizes of gas blocks, your choice of 4 different gas tube lengths, and 2 roll pins.

How to purchase: Use the dropdown menus to choose your size of gas block and gas tube length. Not sure what size you need? Check out the FAQ at the bottom of this page.

About the AT3 Low Profile Steel Gas Blocks:

  • 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 all free float handguards
  • Premium 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

About the AT3 Gas Tubes:

Premium stainless steel gas tubes, available in 4 lengths. Backed by a lifetime warranty.

Not sure what size you need? Measure the distance from the barrel shoulder to the gas port on your barrel and compare it to the chart below. (Carbine is the most common length).

Distance to port:

  • Pistol = 4 inches
  • Carbine = 7 inches
  • Mid = 9 inches
  • Rifle = 12 inches

More Details:

AT3 Gas Block Specifications:

  • 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

AT3 Gas Tube Specifications:

  • Material: Stainless Steel
  • Finish: Natural

Total Tube Length:

  • Pistol: 6 3/4″
  • Carbine: 9 3/4″
  • Mid-length: 11 3/4″
  • Rifle: 15 1/4″

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 are compatible with all the other handguards out there!

Q: How do I know what size of the gas tube I need?

A: Measure the distance from the barrel shoulder to the gas port on your barrel and compare it to the list below. (Carbine is the most common length).

Distance to port:

  • Pistol = 4 inches
  • Carbine = 7 inches
  • Mid = 9 inches
  • Rifle = 12 inches

Products available on this page:

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.

AT3 Lifetime Warranty Logo

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 129 reviews
90%
(116)
5%
(7)
1%
(1)
0%
(0)
4%
(5)
J
James Craig
Excellent fit and finish.

The .750 gas block was a perfect sng fit on my barrel. I had a couple of questions, and Alvin got right back to me with the proper torque specs I needed. The carbine length gas tube and block tube fit perfectly under a very tight 9" keymod handguard. Good products, good prices, fast shipping, and really great people, should you need a little advice or assistance. AT3 is always where I start my search for parts, etc. You should too.

Thank you so much for your review and for choosing AT3 for your AR 15 needs. We're glad to hear that our gas block and gas tube combo worked perfectly for you and that you were satisfied with the fit and finish. Our team takes pride in providing quality products and excellent customer service, so we're happy to hear that Alvin was able to help you with your questions and provide you with the proper torque specs.

S
Steve Jordan
Top Notch

Just Installed the Low Pro Micro Gas Block and M Lok Spear Handguard Gotta say Extremely easy install for this Top Notch Accessories ! Really topped off the Build ! Combined with the AT3 LEO Red Dot This baby is Ready to Rock !

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

K
Kyler Eisenga

Awesome merchandise! AR looks awesome!

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

D
Derek M
another perfect fit

This was my second gas block system from AT3 and the quality is spot on! I'll order more of these kits as I continue to build different AR15's.

D
Dillion Yunto
Wrong size

I have a bushmaster and I ordered the .75 but the barrel is .65 but saved it for the next build

Customers who viewed this item also viewed these products

AT3™ Carbine Tube and .75" Low Profile Long Gas Block - Steel

AT3™ Carbine Tube and .75" Low Profile Long AR 15...

$38.99$33.14
The AT3 Long Low Profile Gas Block is designed to cover up barrel scars
AT3 Tactical Assembled Gas Block and Tube for AR-15 Rifles

AT3 Tactical Assembled Gas Block and Tube Combo for AR-15

$38.99$33.14
Assembled AR-15 Gas Block and Tube – Let Us Simplify Your Build! An assembled

Wojtek Weaponry Adjustable Gas Block + Gas Tube + Roll...

$52.49
The Best Value in Adjustable Gas Blocks! This combo includes your choice of 4
Strike Industries .750" Low Profile Gas Block - AT3 Tactical

Strike Industries .750" Enhanced Low Profile AR 15 Gas Block

Low Profile Skeletonized Gas Block For Extended-Length Free-float Forend Setups The Strike Industries .750″
AT3 Slick Side Billet Upper Receiver - 7 Colors Available

AT3™ Slick Side Upper | Billet Upper Receiver for AR-15

$89.99$76.49
Tough, Sleek, and ready for the AT3 SPEAR M-LOK Handguard Machined from billet aluminum,
LBE Unlimited Low Profile .750 Gas Block with Assembled Gas Tube - AT3 Tactical

LBE Unlimited AR-15 Low Profile .750 Gas Block with Assembled...

(no reviews yet)
Pre-Installed Gas Block and Tube from LBE Unlimited Remove the hassle of trying to
AT3™ AR 15 Gas Tube & Carbine Gas Tube Length

AT3™ AR 15 Gas Tube - Carbine, Mid, Rifle, &...

$13.99$11.89
Quality, USA made stainless steel gas tubes with roll pins for AR rifles. Note:
AT3™ Low Profile Micro Steel Gas Block - 4 Sizes Available

AT3™ Low Profile Micro Steel AR 15 Gas Block -...

$25.99$22.09
This premium Steel Micro Gas Block comes in 4 sizes: .625″, .75″, .875″, and

Wojtek Weaponry Arkto Adjustable Gas Block + Gas Tube +...

$76.99
Wojtek Click Adjustable AR-15 Gas Block with Gas Tube and Roll Pin Outfit your

AT3™ .750" (3/4") Low Profile Long AR 15 Gas Block...

$32.99$28.04
The AT3 Long Low Profile Gas Block is designed to cover up barrel scars
AT3™ AR-10/AR-15 Low Profile Stainless Steel Gas Block - .750" Set Screw

AT3™ AR-10/AR-15 Low Profile Stainless Steel Gas Block - .750"...

$25.99$22.09
Low Profile Stainless Steel .750 Gas Block For Better Heat Dissipation The AT3™ Low
Faxon Firearms Ultra Low-Profile Gas Block - Three Set Screws

Faxon Firearms Ultra Low-Profile AR 15 Gas Block - .625...

Tight Fit and Light Weight – Perfect Gas Block for Featherweight AR15s These ultra-low

Frequently purchased together

AT3™ AR 15 Gas Tube & Carbine Gas Tube Length

AT3™ AR 15 Gas Tube - Carbine, Mid, Rifle, &...

$13.99$11.89
Quality, USA made stainless steel gas tubes with roll pins for AR rifles. Note:
AT3 Slick Side Billet Upper Receiver - 7 Colors Available

AT3™ Slick Side Upper | Billet Upper Receiver for AR-15

$89.99$76.49
Tough, Sleek, and ready for the AT3 SPEAR M-LOK Handguard Machined from billet aluminum,
AT3™ AR-15 Gas Tube Roll Pins

AT3™ AR-15 Gas Tube Roll Pins - Set of 2

$0.99$0.84
AT3™ AR-15 Gas Tube Roll Pins – Set of Two All AT3 Tactical upper
11.5 Inch Faxon Gunner Barrel

Faxon Firearms 11.5 inch Gunner AR 15 Barrel - 5.56...

$151.80
Introducing the BIG GUNNER – Perfect for Suppressed Shooters Ideal for suppressed shooters, the
Faxon Firearms 16 inch Gunner Barrel - 5.56 NATO - Mid-Length - 4150 QPQ

Faxon Firearms 16 inch Gunner AR 15 Barrel - 5.56...

$170.20
Perfectly Balanced Weight and Performance – Get the Most Out of Your Barrel Today!
Faxon Firearms 14.5 inch Pencil Barrel - 5.56 NATO - Mid-Length - 4150 QPQ

Faxon Firearms 14.5 inch Pencil Barrel - 5.56 NATO -...

$161.00
Lightest Barrel in the Industry – No. 1 Choice of Major Brands Faxon Firearms
AT3™ AR15 Barrel Nut & Delta Ring Assembly

AT3™ AR-15 Barrel Nut & Delta Ring Assembly

$16.99$14.44
Mil-Spec Delta Ring Assembly for AR15/M4/M16 Fully assembled, and consists of 4 parts: Mil-Spec
Faxon Firearms 16 inch Government/Socom Barrel – 5.56 NATO – Mid-Length - 4150 QPQ

Faxon Firearms 16 inch Government/Socom AR 15 Barrel – 5.56...

(no reviews yet)
$161.00
Combination Of The Standard M4 Profile & A Heavy Profile The Faxon Firearms 16
AT3 Tactical Crush Washer - 1/2 Inch for 5.56/.223

AT3™ 1/2 Inch Crush Washer for .223/5.56 Muzzle Devices Compatible...

$1.99$1.69
Time Your Muzzle Device with a Black Nitride Crush Washer from AT3 Crush washers
AT3™ Flip-Up Spring-Assisted Backup Iron Sights - Front & Rear Set - Same Plane

AT3™ Flip-Up Spring-Assisted AR 15 Backup Iron Sights - Front...

$44.99$38.24
Spring loaded AR 15 iron sights, designed for quick deployment. These sights are sleek
Faxon Firearms 20 inch Gunner Barrel – 5.56 NATO – Rifle-Length – 4150 QPQ

Faxon Firearms 20 inch Gunner AR 15 Barrel – 5.56...

(no reviews yet)
$188.60
Expect Maximum Versatility, Heat Resistance, & Mitigation Of Barrel Whip The Faxon Firearms 20
AT3 Spear M-LOK Handguard with Cerakote Finishes - 7 Colors

AT3™ SPEAR M-LOK Handguard for AR-15 – 9, 12, &...

$99.99$84.99
The AT3 SPEAR™ is our best, most secure handguard. Simple to install, lightweight, and

Questions & Answers

Don't see the answer
you're looking for?

Loading questions...