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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 22 reviews
    Pleased with purchase

    Function is perfect. Quality is excellent. Cut outs are large enough to allow fingertips to pass through openings and contact hot barrel underneath, so one star deducted for design.

    Thanks for your feedback, Norman. That is noted and we will take a closer look. - AB
    Nice block

    Gas block arrived quickly and fit really well. Would have been nice to have a back up roll pin since mine went flying on the 1st try.

    Thanks for your review, Jeff. Your comment was noted. We're glad you're satisfied with your purchase. - AB
    Gas Block & hand Guard

    Purchased this kit along with a free float 15" hand guard, in the hopes of tightening my groups. Found installation a snap, fit and finish are very good. Have only had the opportunity too try once at range, but it appears that it's mission accomplished.
    Thanks AT3 for a good product at a reasonable price. Will not hesitate to return next time I'm in the market for parts or accessories.

    Glad to hear you're satisfied with everything, Bill! Thank you for the feedback. -- LM
    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
    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