Bravo Company Manufacturing (BCM)
Responsible setup
Verify projectile, magazine, air source, and platform compatibility before ordering. Follow local laws, site rules, agency policy, and manufacturer instructions.
AT3 TacticalAT3 Castle Nut for AR-15 Buffer Tubes
Firearm-compatible AR-15 castle nut with steel construction, Mil-Spec threading, staking notches, wrench cutouts, and multiple color options.
- Vendor
- AT3 Tactical
- Type
- Buffer Tube
- SKU
- AT3-Castle-01
- UPC
- 98720034
- Weight
- 0.1 lb
- Availability
- In stock
Specifications
- Platform Compatibility
- Mil-Spec AR
Specifications
- Platform Compatibility
- Mil-Spec AR
Pairs well with
Recommended add-ons
Strike Industries
Strike Industries Overmolded Enhanced AR Pistol Grip
Bravo Company Manufacturing (BCM)
BCM Gunfighter Vertical Grip Mod 3 - M-LOK
Bravo Company Manufacturing (BCM)
BCM Gunfighter KAG M-LOK Angled Grip
Bravo Company Manufacturing (BCM)
BCM Gunfighter Mod 3 Vertical Grip - Picatinny
Payment & Security
- ACH
- Amazon Pay
- American Express
- Apple Pay
- Bancontact
- Diners Club
- Discover
- Google Pay
- iDEAL
- Mastercard
- PayPal
- Shop Pay
- Shop Pay Installments
- Visa
Your payment information is processed securely. We do not store credit card details or have access to your card number. Available wallet options may vary at checkout.
Questions before ordering?
Use the guides or contact path to confirm fitment for tanks, regulators, projectiles, magazines, and training accessories.
Serving Detroit, Eastpointe, Warren, Macomb County, Oakland County, and Metro Detroit.
GovX ID
Verify Eligibility With GovX ID
Verified eligible customers can access 10% off select qualifying items through GovX. Eligibility, verification approval, and offer availability are determined by GovX. Some products may be excluded.
Verify with GovX IDDescription
Secure and Reliable Fit
Ensure rock-solid stability for your AR-15 buffer tube and stock assembly with this high-quality steel castle nut. Designed for precise fitment and durability, this MIL-SPEC castle nut features standard armorer’s wrench cutouts for easy installation, along with staking notches for added security. Whether you’re building a new rifle, upgrading components, or replacing a worn-out nut, this affordable and rugged castle nut is a must-have.
Key Features:
✔ High-Strength Steel Construction – Provides maximum durability and long-lasting performance.
✔ MIL-SPEC Threading – Ensures secure compatibility with standard AR-15 buffer tubes.
✔ Staking Notches for Secure Installation – Prevents loosening over time, maintaining reliability in demanding conditions.
✔ Compatible with Armorer’s Wrench – Allows for hassle-free installation and removal.
✔ Multiple Cerakote™ Color Options – Add a custom touch to your rifle with FDE, OD Green, Pink, Red, Blue, Burnt Bronze, Tungsten, or Titanium.
✔ Black Phosphate Finish Option – Classic, corrosion-resistant finish for a sleek and tactical look.
✔ Perfect for AR-15 Builds & Upgrades – Works seamlessly with all MIL-SPEC AR-15 lower receivers and buffer tubes.
Available Finishes:
🎨 Customize your build with premium Cerakote™ finishes:
🔹 Black: Phosphate finish for a classic, durable look
🔹 Flat Dark Earth (FDE): H-267 Magpul® Flat Dark Earth
🔹 OD Green (ODG): H-232 Magpul® OD Green
🔹 Pink: H-224 SIG™ Pink
🔹 Red: H-167 USMC Red
🔹 Blue: H-171 NRA Blue
🔹 Burnt Bronze: H-148 Burnt Bronze
🔹 Tungsten: H-237 Tungsten
🔹 Titanium: H-170 Titanium
Built for AR-15 Enthusiasts & Professionals
🔸 Ideal for rifle builders, gunsmiths, and AR-15 enthusiasts
🔸 Designed for secure fitment on MIL-SPEC buffer tubes
🔸 Ensures long-term durability and enhanced performance
When reliability and stability matter, trust this steel castle nut to lock your buffer tube assembly in place.
✅ Upgrade your AR-15 today with a battle-tested castle nut that won’t let you down!AT3




