Fortis Manufacturing AR-15 End Plate & Castle Nut Set
Fortis Manufacturing, Inc.
$19.90
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Fortis Manufacturing, Inc.
Fortis Manufacturing AR-15 End Plate & Castle Nut Set
The Fortis End Plate & Castle Nut combo delivers a premium, lightweight upgrade for AR-15 and AR-308 builds, pairing a QD-ready end plate with a precision-machined billet aluminum castle nut for a polished, functional finish.
- Machined from 6061 billet aircraft-grade aluminum for maximum strength and minimal weight
- Integrated quick detach swivel socket for fast, secure sling attachment
- Compatible with mil-spec carbine buffer tubes on AR-15 and AR-308 platforms
- Black mil-spec anodize finish resists corrosion and wear in hard-use conditions
- Significant weight savings over standard steel castle nuts without sacrificing durability
- Proudly designed and manufactured in the USA by Fortis Manufacturing
Who This Is For
This combo is ideal for AR-15 and AR-308 builders and owners who want to reduce overall rifle weight, add a reliable QD sling mount at the stock, and upgrade the aesthetics of their buffer tube assembly — all in a single, no-compromise package. It suits competitive shooters, tactical users, and enthusiasts alike who demand quality components without unnecessary bulk.
Specifications
| Brand | Fortis Manufacturing, Inc. |
|---|---|
| Material | 6061 Billet Aircraft-Grade Aluminum |
| Finish | Black Mil-Spec Anodize |
| Buffer Tube Compatibility | Mil-Spec Carbine Buffer Tubes |
| Platform Compatibility | AR-15 / AR-308 |
| QD Socket | Yes — Single Quick Detach Swivel Socket |
| Country of Origin | USA |
| Includes | End Plate & Castle Nut |
Frequently Asked Questions
Will this end plate and castle nut fit my commercial-spec buffer tube?
The Fortis End Plate and Castle Nut combo is designed specifically for mil-spec carbine buffer tubes. Commercial-spec buffer tubes have a slightly different diameter and thread pitch, so this combo may not fit or seat correctly on a commercial tube. If you are unsure which buffer tube you have, check the manufacturer's documentation or measure the tube's outer diameter — mil-spec tubes typically measure approximately 1.14 inches in diameter.
What type of sling swivel is compatible with the QD end plate socket?
The Fortis QD End Plate features a standard quick detach swivel socket compatible with most push-button QD sling swivels commonly found on single-point and two-point tactical slings. This includes popular options from brands like Magpul, Blue Force Gear, and Viking Tactics. Always verify your sling swivel's QD button size against the socket before purchasing.
Does the aluminum castle nut require staking, and how durable is it compared to steel?
Yes, like any castle nut, the Fortis aluminum castle nut should be properly torqued and staked to the end plate to prevent loosening under recoil. While aluminum is lighter than steel, the 6061 billet construction and mil-spec anodize finish provide excellent durability for standard shooting applications. It is a proven upgrade for builders prioritizing weight reduction without compromising the integrity of the buffer tube assembly.