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    We Ship Fast!

    Order by 1PM CST for Same Day Shipping (Mon-Fri)

    Buy as a set and save!

    This combo includes your choice of 4 different sizes of gas block, 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 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 gas tube I need? 
    A: Measure the distance from the barrel shoulder to the gas port on your barrel and compare 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

    Have Questions About this Product?

    Ask Us Now

    Customer Reviews

    Based on 19 reviews
    84%
    (16)
    16%
    (3)
    0%
    (0)
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    S
    S.S.
    Gas tube kit

    Worked beautifully. No complaints whatsoever. Fast shipping. Great deals. At3 tactical does it again.

    Thank you for another feedback, Stuart! We are always happy to have you. -- LM
    R
    R.B.
    Gas block & tube assembly

    I received the gas block, roll pin and carbine length gas tube. Upon inspection, it is of really good quality. No fitment issues. I'm 100% satisfied with the product and would definitely buy another in the future as well as recommend it to others.

    Thanks for spreading a good word for AT3, Rodney! We work hard to meet expectations like yours, and we’re happy to hear we hit the mark for you. Cheers! - AB
    s
    s.s.
    Prefict fit

    The gas tube roll pin hole was just the right size. No trouble putting it in. That's been a problem in the past.

    We really appreciate you taking the time out to post a review, Scott. We count ourselves lucky for customers like you. Cheers! - AB
    e
    e.f.
    Fast service

    Bought this AT3 gas block for my .458 Socom . Fits good fires great and super fast service with delivery.

    J
    J.J.
    5 star!

    Great has block. Super fast shipping. Thanks AT3!

    It's our pleasure doing business with you, Jason. Thank you for the feedback! -- LM