Build More, Save More | Get up to $220 Off! | Shop Now

Build More, Save More | Get up to $220 Off! | Shop Now

Armaspec Self-Retention “No Stake” Castle Nut

Be the first to review

Orders will Ship within 1 Business Day

Backed by the Armaspec Lifetime Warranty!

TOP ADD-ON'S

Magpul UBR | 2.0 Carbine Stock w/ Buffer Tube – AR15/M4 – MAG482

Magpul UBR | 2.0 Carbine Stock w/ Buffer Tube – AR-15/M4 – MAG482

Starting at:
$208.95

AT3™ Mil Spec AR-15 Buffer Tube - 9 Colors Available - Black

$17.99

Armaspec Self-Retention Castle Nut Eliminates Staking and Thread Locker

Features

Patented self-retention thread design locks without staking or thread locker
Tool-free installation and removal
Mil-Spec compatibility with AR-15/M4 platforms
7075-T6 aluminum construction
Hardcoat anodized finish resists corrosion

This castle nut solves the common problem of loose buffer tube assemblies that plague standard castle nuts over time. It works exceptionally well for builders who need reliable retention without permanent modifications or messy thread compounds. The patented self-retention design sets it apart by maintaining consistent torque and preventing loosening under recoil without requiring specialized tools or gunsmith services.

Specifications

Brand: Armaspec
Model: Self-Retention Castle Nut
MPN: ARM6521
Material: 7075-T6 Aluminum
Finish: Hardcoat Anodized
Compatibility: AR-15/M4 Buffer Tubes
Colors Available:
- Black
- Flat Dark Earth (FDE)
- OD Green
- Bronze

What’s Included?

1x Armaspec Self-Retention Castle Nut

Products available on this page:

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

Armaspec Lifetime Warranty

All Armaspec products carry a LIFETIME WARRANTY and are warranted to be free from defects in material or workmanship.
Should there be a defect, we will repair or replace the product at our discretion at no cost to you.
Lifetime warranty does not apply to products sold as “blemished” or “manufacturer refurbished”.
You must have proof of purchase to initiate a WARRANTY claim.

Please email to rma@armaspec.com to request an RMA number.

Disclaimer: Manufacturer’s warranty is subject to change without prior notice.

Leave your review

Rating

Your Name: Your Email:

Your review:

Upload Image(s): You can upload a maximum of 2 images.
Allowed file types: .jpg, .jpeg, .gif, .png, .webp.
Maximum file size: 5MB.

Customers who viewed this item also viewed these products

Armaspec Self-Retention "No Stake" Castle Nut and QD End Plate

(1)

Armaspec Self-Retention “No Stake” Castle Nut and QD End Plate

Armaspec “No Stake” Castle Nut and QD End Plate Combo Eliminates Staking While Adding

LBE Unlimited AR-15 Castle Nut

(4)

LBE Unlimited AR-15 Castle Nut

LBE Unlimited AR-15 Castle Nut The LBE Unlimited AR15 Castle Nut is an essential

(4)

Strike Industries V2 Enhanced AR-15 Castle Nut with Extended QD...

TRIBUS Enhanced Anti-Rotation Castle Nut & Extended End Plate Introducing the TRIBUS Enhanced Anti-Rotation

Fortis Standard AR-15 Castle Nut - AT3 Tactical

(2)

Fortis Standard AR-15 Castle Nut

Lightweight Aluminum Castle Nut Only a third of the weight of a mil-spec steel

(2)

Strike Industries Multi-Function End Plate with Anti-Rotation Castle Nut

Strike Industries Multi-Function End Plate with Anti-Rotation Castle Nut The SI Multi-Function End Plate

(2)

Strike Industries Enhanced AR-15 Castle Nut with Extended QD Endplate

Elevate Your AR-15 with Strike Industries’ Enhanced Castle Nut and End Plate The Strike

Fortis K2 Enhanced End Plate with Ratcheting Castle Nut - AT3 Tactical

(5)

Fortis K2 Enhanced End Plate with Locking Lever and Castle...

Ratcheting AR-15 Endplate and Castle Nut The K2 castle nut and endplate from Fortis

Strike Industries Modular Magazine Catch for AR15 - AT3 Tactical

Strike Industries Modular Magazine Catch for AR-15

Improve Your Performance with the Modular Magazine Catch from Strike The Strike Industries Modular

Phase 5 Weapon Systems Oversized AR-15 Magazine Release - AT3 Tactical

Phase 5 Weapon Systems Oversized AR-15 Magazine Release

Larger Contact Surface Magazine Release For Easy Access & Faster Reloads The Phase 5

BCM MK2 Receiver Extension for AR-15 - AT3 Tactical

BCM MK2 Receiver Extension for AR-15

8 Position AR-15 Buffer Tube for MK2 Recoil System BCM’s MK2 Receiver Extension is

(1)

Geissele Ultra Duty AR-15 Mag Release Button

Textured and Enlarged Magazine Button Designed for shooters who need reliable controls, the Geissele

AT3 Tactical Castle Nut for AR15

(102)

AT3™ Castle Nut for AR-15 Buffer Tubes – 9 Colors...

Secure Your AR15 Buffer Assembly with a Steel Castle Nut This steel castle nut

Frequently purchased together

(35)

AT3™ Mil Spec End Plate for AR-15 – 9 Colors...

Mil-Spec Steel Endplate for AR15 Lower Receivers This standard endplate is compatible with any

(128)

AT3™ Mil Spec AR-15 Buffer Tube – 9 Colors Available

Mil-Spec AR-15 Carbine Buffer Tube Made 6061-T6 aluminum construction with a black anodized finish,

(22)

Timber Creek Outdoors QD End Plate – QD-EP for AR-15

Ambidextrous Attachment for Slings Timber Creek’s QD End Plate is an upgrade for your

RECOMMENDED

(125)

AT3™ Pro-Builder™ AR-15 Lower Parts Kit – No Grip or...

Perfect Lower Parts Kit for the Premium Builds This quality lower parts kit excludes

(17)

AT3 Tactical™ Complete AR-15 Upper Parts Kit – Forward Assist...

Complete Upper Parts Kit For Your Stripped Upper Receiver The AT3 Tactical™ AR-15 Upper

AT3 Tactical Carbine Buffer Spring for AR15

(19)

AT3™ Carbine Buffer Spring for AR-15

Carbine Buffer Spring for 6-Position Adjustable Buffer Tubes This spring will fit in any

(544)

AT3™ FU-BAG™ AR-15 Lost Parts Kit – Springs, Detents, Replacement...

Made an “Oops” with your New Build? You Detent-Launchin’, Spring-Losin’ Fool, you. We’ve all

(12)

AT3 Tactical AR-15 Takedown and Pivot Pin Assembly

AR-15 Takedown and Pivot Pins with Springs and Detents If you’re completing an AR-15

(9)

Timber Creek Outdoors AR-15 Forward Assist Assembly

Add a Custom Look to Your Upper with the TCO Forward Assist If you’re

Sale!

AT3 Tactical AT-15 Lower Receiver - AR-15 Stripped Lower Receivers

(17)

AT3™ AT-15 Stripped Lower Receiver – Anodized and Cerakote

AT3 Tactical AR-15 Cerakote Stripped Lower Receiver The AT-15 is the AT3 Tactical take

Sale!

AT3 Tactical AR-15 Cerakote Color Upgrade Kit - Flat Dark Earth

(14)

AT3 Tactical AR-15 Cerakote Color Upgrade Kit

Cerakote Color Accent Parts Kit Cerakote color parts for your AR-15 can enhance your

Sale!

(10)

Timber Creek Outdoors AR Pivot and Takedown Pin Set –...

Cerakote or Anodized Takedown and Pivot Pin Set These CNC machined pins are an

Questions & Answers

Don't see the answer
you're looking for?

Loading questions...