+1-800-504-5897 Live Chat Help Center Check Order Status
About Us Policies Reviews How To
Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC, and to all U.S. Military APO/FPO/DPO addresses.

Enjoy our FREE RETURNS

We want to ensure that making a return is as easy and hassle-free as possible! If for any reason you are not satisfied with your purchase, simply return the item within 30 days of receipt, and we'll cover the cost of return shipping. Learn more about our Return Policy.

  • Entire Store
  • ...
  • Apparel & Footwear
  • Astronomy
  • Everything Else
  • Eyewear
  • Hunting Gear
  • Lab Equipment
  • Military Gear
  • Outdoor Gear
  • Photography Equipment
  • Police, EMS & Fire
  • Shooting
  • Sport Optics
  • Sports & Hobbies
TIP
Shopping Cart

Guntec USA AR-15 Heavy Duty Wide Castle Nut For Car/M4 Buffer Tube Gun Model: AR-15, Condition: New, Color: Black, 24% Off

GUNTEC USA AR15 Heavy Duty Wide Castle Nut For Car/M4 Buffer Tube, Black, CASTLE-HD
GUNTEC USA AR15 Heavy Duty Wide Castle Nut For Car/M4 Buffer Tube, Black, CASTLE-HD
1 of 1 images
GUNTEC USA AR15 Heavy Duty Wide Castle Nut For Car/M4 Buffer Tube, Black, CASTLE-HD

Tap Tap to Zoom

Government Export Restriction Government Export Restriction
Questions & Answers
Where is this part made? Expert Answer

No country of origin is listed for this product.

Mark H.

by Mark H., Gear Expert, December 18, 2018
See 1 More Answer
What is the actual thickness Expert Answer

The manufacturer has not provided that information. We recommend contacting them directly, they should be able to provide you with that information. You can reach them here: https://www.guntecusa.com/contact

by Ethan C., Gear Expert, September 13, 2019
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
It’s a Solid castle nut by Capt Gus, Verified Owner, November 13, 2018
It does what it needs to ,do it works fine It’s not rocket science. You can buy cheaper or you can spend more money. But this works great. My armorers wrench was able turn this nice and snug no problem
4/4 found this helpful
Helpful Positive Review
Castle nut by Rich, November 15, 2018
This really makes my charger look nice paired with the brace and tube I bought from optics planet. I called to make sure which one I needed. The person I talked to was very nice and knowledgable. He also took my order over the phone My package arrive...
Read More...
3/3 found this helpful
Helpful Positive Review
Guntech buffer tube castle nut by Mr., December 22, 2018
The guntech buffer tube castle nut was a great buy! This particular castle nut has crisp threads for ease of installation. The nut went right on and secured my end plate with ease. It was easy to tighten and stayed put with rugged use! Great product ...
Read More...
3/3 found this helpful
Helpful Positive Review
Everything you need, nothing you don't! by Patrick, Verified Owner, September 11, 2019
It's a heavy duty end plate. Screws on tight, stakes easily enough, feels durable and as strong as can be. Mounted properly, this thing won't come off unless you really want to take it off. No need to waste the money on any other castle nut, stick ...
Read More...
4/4 found this helpful
Helpful Positive Review
Its a good castle nut for sure by Albert Switzer, Verified Owner, December 12, 2023
Nice thick boy castle nut won't go anywhere. Doesn't look goofy.
1/1 found this helpful
Helpful Positive Review
A good looking nut by MnkyPew, Verified Owner, February 4, 2024
The product description is accurate, super high-quality, does not scratch or dent while screwing on. Can be used with a fixed stock or multi position.
1/1 found this helpful
Read All 11 Reviews
Gun Model:
AR-15
Condition:
New
Color:
Black

Code: 2AH-CAN-CASTLE-HD

MPN: CASTLE-HD

UPC: 714569647827

List: $11.98Save 25%
$8.99

Product Info for Guntec USA AR-15 Heavy Duty Wide Castle Nut For Car/M4 Buffer Tube

Gen 2 Extra Wide For Stronger, More Durable Hold Steel Fits Mil-spec/Commercial Buffer Tubesimage

Specifications for Guntec USA AR-15 Heavy Duty Wide Castle Nut For Car/M4 Buffer Tube:

Manufacturer: Guntec USA
Gun Model: AR-15
Condition: New
Color: Black

Package Contents:

  • Guntec USA AR-15 Heavy Duty Wide Castle Nut For Car/M4 Buffer Tube

What firearm models does the manufacturer say Guntec USA AR-15 Heavy Duty Wide Castle Nut For Car/M4 Buffer Tube is compatible with?

The manufacturer says that Guntec USA AR-15 Heavy Duty Wide Castle Nut For Car/M4 Buffer Tube is compatible with AR-15

Guntec USA AR-15 Heavy Duty Wide Castle Nut For Car/M4 Buffer Tube Orderable Models

List of Orderable Models

  • Guntec USA AR-15 Heavy Duty Wide Castle Nut For Car/M4 Buffer Tube, Black, CASTLE-HD , MPN: CASTLE-HD , UPC: 714569647827 , Code: 2AH-CAN-CASTLE-HD

Guntec USA AR-15 Heavy Duty Wide Castle Nut For Car/M4 Buffer Tube Unavailable & Discontinued Models

List of Unorderable Models

  • USED Guntec USA AR-15 Heavy Duty Wide Castle Nut For Car/M4 Buffer Tube, Black, CASTLE-HD, EDEMO3, Condition Fair, Other , MPN: CASTLE-HD-EDEMO3 , Code: 2AH-CAN-CASTLE-HD-EDEMO-OT-D
Compare (0)
1 item has been added
Add at least two items to compare
Last updated 2026-09-02 UTC.