Shop All - Firearm Accessories & Parts - AR15 Parts & Accessories - Lower Parts - Castle Nuts

Armaspec

Armaspec Self-Retention Castle Nut FDE AR-15 / AR-10 - ARM6521-FDE

MSRP: $29.99

Was:

Now: $26.99

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Armaspec

Armaspec Self-Retention Castle Nut Black AR-15 / AR-10 - ARM6521-BLK

MSRP: $29.99

Was:

Now: $26.99

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LWRC International

LWRCI 9-Tooth Barrel Nut

MSRP: $24.00

Was:

Now: $19.00

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Luth-AR

Tacfire Carbine Lock Ring Castle Nut - Black

MSRP: $5.99

Was:

Now: $4.99

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LBE Unlimited

LBE Unlimited Mil-Spec AR15 Castle Nut - Black

MSRP: $8.99

Was:

Now: $6.95

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Fortis MFG

Fortis END-CN-COMBO QD Castle Nut & End Plate | Heavy-Duty AR-15 Buffer Tube Combo with Quick Disconnect Sling Mount

MSRP: $39.59

Was:

Now: $20.95

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Fortis MFG

Fortis Manufacturing Standard Castle Nut - Black Anodized Finish, Mil Spec

MSRP: $16.95

Was:

Now: $16.10

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Strike Industries

Strike Industries Enhanced Castle Nut w/ QD - Fits AR-15, Black

MSRP: $60.95

Was:

Now: $57.95

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Fostech, Inc.

Fostech Ultra-Light Castle Nut

MSRP: $19.99

Was:

Now: $13.99

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Strike Industries

Strike Industries AR Enhanced Castle Nut & Extended End Plate w/ QD - Fits AR-15, Red

MSRP: $60.95

Was:

Now: $55.95

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Guntec USA

Guntec USA AR-15 Extreme Duty Wide Castle Nut For Car/M4 Buffer Tube - CASTLE-EXD

MSRP: $16.95

Was:

Now: $14.95

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LanTac USA

LanTac USA RPS Ratchet Plate System - 01-UP-RPS

MSRP: $54.99

Was:

Now: $52.95

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Strike Industries

Strike Industries Ultralight Multi-Function End Plate and Anti-Rotation Castle Nut - Black

MSRP: $32.95

Was:

Now: $29.95

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Strike Industries

Strike Industries TRIBUS Enhanced AR-15 Castle Nut and End Plate

MSRP: $66.95

Was:

Now: $59.95

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Luth-AR

Luth-AR Carbine Lock Ring (Castle Nut) - CS-02

MSRP: $5.99

Was:

Now: $4.99

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Armaspec

Armaspec Self-Retention Castle Nut FDE AR-15 / AR-10 - ARM6521-FDE

Armaspec Self-Retention Castle Nut – Flat Dark Earth – ARM6521-FDE The Armaspec Self-Retention Castle Nut (ARM6521-FDE) is an innovative, high-performance alternative to the standard Mil-Spec steel castle nut, specifically finished in Flat...

MSRP: $29.99

Was:

Now: $26.99

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Armaspec

Armaspec Self-Retention Castle Nut Black AR-15 / AR-10 - ARM6521-BLK

Armaspec Self-Retention Castle Nut – Black – ARM6521-BLK The Armaspec Self-Retention Castle Nut (ARM6521-BLK) is a revolutionary solution for AR-platform builders who want to move beyond the traditional "stake and hammer" method of securing a...

MSRP: $29.99

Was:

Now: $26.99

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LWRC International

LWRCI 9-Tooth Barrel Nut

LWRCI 9-Tooth Barrel Nut / Locking Ring The LWRCI 9-Tooth Barrel Nut (U01-0178C01) is the essential structural component for securing the proprietary barrel system on LWRCI rifles. Unlike standard AR-15 barrel nuts, this 9-tooth "Locking Ring" is a...

MSRP: $24.00

Was:

Now: $19.00

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Luth-AR

Tacfire Carbine Lock Ring Castle Nut - Black

TacFire Official AR15 Castle Locking Nut for .223/5.56 Rifle carbine stock used to tighten buffer tube to receiver. Finish: Maganese Phoshate Application: AR10, AR15, M-16, Carbine

MSRP: $5.99

Was:

Now: $4.99

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LBE Unlimited

LBE Unlimited Mil-Spec AR15 Castle Nut - Black

Threaded Steel ring used to retain the carbine buffer tube to the lower receiver Finish: Maganese Phoshate Material: 4140 Steel Application: AR10, AR15, M-16, Carbine Made in the USA

MSRP: $8.99

Was:

Now: $6.95

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Fortis MFG

Fortis END-CN-COMBO QD Castle Nut & End Plate | Heavy-Duty AR-15 Buffer Tube Combo with Quick Disconnect Sling Mount

The Fortis Manufacturing Castle Nut and End Plate Combo is a premium, mil-spec compatible set designed for AR-15 and AR-10 platforms. It includes a reinforced castle nut and a heavy-duty end plate with an integrated quick-disconnect (QD) sling swivel...

MSRP: $39.59

Was:

Now: $20.95

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Fortis MFG

Fortis Manufacturing Standard Castle Nut - Black Anodized Finish, Mil Spec

The Fortis Standard Castle Nut is manufactured from a solid piece of billet aircraft grade aluminum that offers a significant weight reduction to your castle nut. If you're trying to save ounces, this is a great way, but without sacrificing durability...

MSRP: $16.95

Was:

Now: $16.10

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Strike Industries

Strike Industries Enhanced Castle Nut w/ QD - Fits AR-15, Black

Yet another first, the Enhanced Castle Nut and Extended End Plate combo represent Strike Industries' dedication to thinking outside the box. The SI Enhanced ECN and EEP stand out from the generic parts kit units in both aesthetics and function. The...

MSRP: $60.95

Was:

Now: $57.95

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Fostech, Inc.

Fostech Ultra-Light Castle Nut

This castle nut is an excellent choice for anyone looking to save ounces on their build. Approximate Weight: .20 ounces Material: Aluminum

MSRP: $19.99

Was:

Now: $13.99

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Strike Industries

Strike Industries AR Enhanced Castle Nut & Extended End Plate w/ QD - Fits AR-15, Red

Yet another first, the Enhanced Castle Nut and Extended End plate combo represent Strike Industries’ dedication to thinking outside the box. The SI Enhanced ECN and EEP stand out from the generic parts kit units in both aesthetics and function. The...

MSRP: $60.95

Was:

Now: $55.95

Add to Cart
Guntec USA

Guntec USA AR-15 Extreme Duty Wide Castle Nut For Car/M4 Buffer Tube - CASTLE-EXD

GunTec has a AR15 Extreme Duty Wide Castle Nut for Car/M4 Buffer Tube to provide more strength and durability for your AR. Made in the USA. FEATURES: US Made Steel Gen 3 -Newest Design Fits Mil-spec/Commercial Buffer Tubes Enhanced Design For Extreme...

MSRP: $16.95

Was:

Now: $14.95

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LanTac USA

LanTac USA RPS Ratchet Plate System - 01-UP-RPS

The LANTAC RPS™ Ratchet Plate System removes the necessity to stake castle nuts in place after fitting. It also provides a QD Sling attachment point directly below the buffer tube. It utilizes a one piece designed ratcheted tooth and arm,...

MSRP: $54.99

Was:

Now: $52.95

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Strike Industries

Strike Industries Ultralight Multi-Function End Plate and Anti-Rotation Castle Nut - Black

The Strike Industries Ultralight Multi-Function End Plate and Anti-Rotation Castle Nut are designed to update and upgrade the often neglected castle nut and endplate system. Now available in an ultralight 7075-T6 aluminum version that is anodized in...

MSRP: $32.95

Was:

Now: $29.95

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Strike Industries

Strike Industries TRIBUS Enhanced AR-15 Castle Nut and End Plate

Introducing the TRIBUS Enhanced Anti-Rotation Castle Nut & Extended End Plate. The TRIBUS is next iteration of our previous AR-ECN&EEP. New features include two addition QD mounting points added to the left & right side of the extended...

MSRP: $66.95

Was:

Now: $59.95

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Luth-AR

Luth-AR Carbine Lock Ring (Castle Nut) - CS-02

Threaded Steel ring used to retain the carbine buffer tube to the lower receiver Finish: Maganese Phoshate Application: AR10, AR15, M-16, Carbine

MSRP: $5.99

Was:

Now: $4.99

Add to Cart