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AT3™ Carbine Tube and .75″ Gas Block Top and Bottom Picatinny Rails – Aluminum

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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.

A lightweight aluminum gas block with top and bottom picatinny rails and Carbine Gas Tube

  • Roll Pin included

How do I know this will fit? Measure the distance from the barrel shoulder to the gas port on your barrel if it is 7 inches than this will work.


  • Gas block with top & bottom picatinny rails – top rail sits at height of AR-15 flat top receiver
  • 3 rail slots on the top, 4 on the bottom
  • Secured with 2 set screws (screws and allen wrench included)
  • Also includes 5/64″ roll pin and allen wrench for set screws
  • 3/4″ (.75″) size – works with any .75″ AR-15 barrel
  • Perfect for use with quad rail system
  • One piece construction, solid fit!
  • Length is designed to cover up blemishes on barrel after removing front sight base
  • Secured with 2 set screws (screws and allen wrench included)
  • ?Backed by the AT3 Lifetime Warranty


  • Material: 6061 Aircraft Aluminum
  • Finish: Hardcoat Anodized
  • Length: 1 7/8 inch
  • Inside Diamter: .75″ (3/4 inch)
  • Weight: 2.6 oz
  • Packaging: PE Bag


  • Material: Stainless Steel
  • Finish: Natural
  • Total Tube Length: 9 3/4″

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Customer Reviews

Based on 1 review
No blow

Wouldn’t cycle. Had to go to a smith. Put on a utg railed block. Hated the setup. Switched to a lopro block with a diamondhead freefloat rail. Love that.