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Free Float Quad Rail Endcap - 1.75" Diameter End Cap - for AT3 T-Series Quad Rails

Free Float Quad Rail Endcap – 1.75″ Diameter End Cap – for AT3 T-Series Quad Rails

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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.


Compatibility: AT3 Tactical T-Series Quad Rails (Does not work with Pro series quad rails)
Material: 6061 aircraft aluminum
Finish: Hardcoat Anodized (black)
Outside Diameter: 1.75″
Inside hole diameter: 1.1″
Packaging: PE Bag


– Easy to install – mounts to end of quad rail using 4 hex screws (included)
– Works with many types of free float quad rails, including those made by AT3 Tactical
– Works with barrels up to 1″ diameter

Backed by the AT3 Lifetime Warranty

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Customer Reviews

Based on 25 reviews

Just want to say what a great company super product and fast service, Thanks for everything.

great service

Just what I wanted for the end of my handguard, perfect fit hardware included, and small allen wrench. Excellent customer service, fsst shipping

Thank you for the feedback, Jose! We're glad you had a good experience and that you're liking the product.
great service

Called AT3 Tactical, great service, fast response, and vey fast shipping. Great company

Just what I wanted.

Just what I wanted...Quick delivery..Good price...I have bought before..

We are glad to hear this fit what you were looking for and got out to quickly.
Works as it should

No issues. Used on .300 AAC Blackout and .223/5.56 pistol builds. This is the only end cap that I've found that can be installed after installing a Kaw Valley Precision Linear Comp. Like the counter-sunk screws too.

We are happy to hear that this rail endcap is working for both of these builds!