Anderson Manufacturing AR-15 Buffer Tube Castle Nut – HR Tactical Innovations Anderson Manufacturing AR-15 Buffer Tube Castle Nut

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Anderson Manufacturing  |  SKU: AM-26

Anderson Manufacturing AR-15 Buffer Tube Castle Nut 0.1 lb


Regular price $9.99 USD
Shipping calculated at checkout.


🎁 Holiday & Black Friday Buyer’s Guide 2025

Most in-stock items ship within 3–4 business days.

If an item shows Backorder or Special Order, extra vendor lead time applies.

To ensure delivery before Christmas, place your order by the following dates (includes fulfillment time):

USPS Ground Advantage – Order by Dec 13

USPS Priority Mail – Order by Dec 14

USPS Priority Mail Express – Order by Dec 16

UPS 3-Day Select – Order by Dec 15

UPS 2-Day Air – Order by Dec 18

UPS Next Day Air – Order by Dec 19

International customers: Order by Nov 28 – Dec 5, depending on service and location.

For full vendor lead times and detailed shipping info, read the complete Holiday Buyer’s Guide →

🚚 Shipping Information

Most in-stock items ship within 3 business days.

Special order items are typically processed within 14 business days (excluding weekends and holidays).

Custom items may require additional time depending on production schedules.

If you’d like to receive your order sooner, please select an expedited shipping option at checkout.

Some products ship directly from the manufacturer, and an equivalent carrier or service level will be chosen to match your selected shipping speed.

Shipping delays caused by carriers are outside our control, but we’ll always help track updates.

See our Shipping Policy for details.



🔄 Returns & Warranty Support

Returns are accepted within 14 days for items that are unused, unopened, and in original packaging with no damage.

A restocking fee applies, but it may be partially waived if store credit is selected instead of a refund to the original payment method.

Custom builds, sale items, and hazardous goods are final sale.

Warranty Coverage: Manufacturer warranties apply to all standard products. Any defects, malfunctions, or performance issues are handled directly by the manufacturer per their terms.

HR Tactical Innovations covers a Fitment & Functionality Guarantee on all custom or modified items — if a verified production error occurs, we’ll replace the item.

View our Refund Policy for full details.

🌍 International Customers

We ship worldwide to Canada, Mexico, Europe, Asia, and Oceania, including:

🇨🇭 Switzerland • 🇨🇿 Czechia • 🇩🇪 Germany • 🇩🇰 Denmark • 🇪🇸 Spain • 🇫🇮 Finland • 🇫🇷 France • 🇬🇧 United Kingdom • 🇭🇰 Hong Kong SAR • 🇮🇪 Ireland • 🇮🇹 Italy • 🇯🇵 Japan • 🇰🇷 South Korea • 🇲🇾 Malaysia • 🇳🇱 Netherlands • 🇳🇴 Norway • 🇵🇱 Poland • 🇵🇹 Portugal • 🇸🇪 Sweden • 🇸🇬 Singapore • 🇦🇺 Australia • 🇳🇿 New Zealand • 🇦🇪 UAE and more.

Transit averages 2–4 weeks depending on customs clearance. We are not responsible for customs delays. Reduced transit times are only available through expedited shipping options.

Import duties, VAT, and taxes are not included in your order total and must be paid by the recipient.

If a package is rejected, unclaimed, or returned due to unpaid duties, an incorrect address, or failure to collect, it will be handled under our Refund Policy. Shipping costs are non-refundable in these cases.


Pressurized or restricted items ship ground only where permitted.

Questions? Contact ops@hrtacticalin.com before checkout.

🎖️ GovX Military, First Responder & Teacher Discount

Description

Reliable Buffer Tube Security for Your AR-15 Build

The Anderson Manufacturing MIL-SPEC AR-15 Castle Nut is a critical component in securing the buffer tube and stock system to your lower receiver. Built from high-quality steel and Manganese Phosphate coated, this durable castle nut is designed to ensure a solid and reliable connection between the buffer system and the lower receiver—preventing loosening, maintaining stability, and improving long-term durability.


Key Features:

MIL-SPEC Dimensions – Compatible with all standard AR-15 buffer tubes, ensuring a secure fit.
Manganese Phosphate Finish – Provides corrosion resistance and long-lasting durability.
Precision Machined for Secure Fit – Designed for proper torque application, allowing for a rock-solid buffer system attachment.
Wrench Cutouts for Easy Installation – Castle turret-style cutouts allow a castle nut wrench to provide the necessary torque for a secure hold.
Cutout for Staking – Prevents the castle nut from loosening over time, ensuring maximum reliability.
Made in the USA – Manufactured to strict MIL-SPEC standards for uncompromising performance.


Why It Matters:

The castle nut plays a critical role in maintaining the integrity of the buffer system on an AR-15. A loose castle nut can cause instability, leading to malfunctions or premature wear. By staking the castle nut with the end plate, you mechanically lock it in place, preventing it from backing off during extended use.

For optimal installation:
🔹 Torque to 40 ft/lbs – No thread locker is required.
🔹 Position wrench cutouts away from the receiver – Align the smaller cutout with the end plate.
🔹 Stake the end plate into the castle nut – Lightly tap with a hardened punch to lock it in place while still allowing for removal if necessary.


Perfect for Any AR-15 Build

Whether you're building a new rifle or replacing a worn-out castle nut, the Anderson Manufacturing MIL-SPEC Castle Nut ensures a secure, long-lasting connection between your buffer system and receiver—so you can focus on accuracy, reliability, and performance.

Upgrade your AR-15 with a castle nut built for strength and reliability!

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