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Guntec USA AR15 Castle Nut Wide Extreme Duty Black

Guntec USA AR15 Castle Nut Wide Extreme Duty Black

Guntec Usa · Buffer Tubes & Springs

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Best price

$20.66at MidwayUSA

In stock checked Nov 3, 2026

Buy at MidwayUSA

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Where to buy

StorePriceAvailabilityBuyAdd to build
MidwayUSA Best price $20.66checked Nov 3, 2026 In stock Buy at MidwayUSA
OpticsPlanet $27.99checked Nov 3, 2026 In stock Buy at OpticsPlanet
Battlehawk Armory $11.99Salechecked Nov 3, 2026 Check store Buy at Battlehawk Armory

Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.

Price history

Lowest in-stock price in the last 30 days: $20.66 at MidwayUSA. Dashed line = out of stock. Tracking since Oct 28, 2026.

Show the prices as a table
StoreLatestLowestHighest
Battlehawk Armory$11.99$11.99$11.99
MidwayUSA$20.66$20.66$20.66
OpticsPlanet$27.99$27.99$27.99

Since Oct 28, 2026.

About this part

The Guntec USA AR15 Castle Nut Wide Extreme Duty Black is an AR-15 buffer part from Guntec Usa. It's sold by 3 stores (2 in stock), from $11.99 to $27.99. The lowest in-stock price in the last 30 days was $20.66 at MidwayUSA.

Specifications

Manufacturer
Guntec Usa
Platform
AR-15

From the manufacturer

Guntec USA AR15 Castle Nut Wide Extreme Duty Black. The wide design of this AR15 Wide Castle Nut by Guntec USA makes the area around the buffer tube much less prone to snags and breakage greatly enhancing the strength and durability of the Nut. The Guntec AR15 Wide Castle Nut Car/M4 Buffer Tube is made with an enhanced design that provides the utmost strength and durability providing the customer with a quality product at an amazing value that will be long-lasting. For a great way to make sure you are shooting with some of the best possible equipment the rifle industry has to offer choose the Guntec Wide Rugged Extrme Duty Nut Car/M4 Buffer Tube. Specifications for Guntec USA AR-15 Extreme Duty Wide Castle Nut For Car/M4 Buffer Tube: Manufacturer: Guntec USA Gun Model: AR-15 Condition: New Included Accessories: None Fabric/Material: Steel Quantity: each Length: 1 in Diameter: 1.375 in Features of Guntec USA AR-15 Extreme Duty Wide Castle Nut For Car/M4 Buffer Tube Fits Mil-spec/Commercial Buffer Tubes Enhanced Design For Extreme Strength & Durability Package Contents: Guntec USA AR-15 Extreme Duty Wide Castle Nut For Car/M4 Buffer Tube The Guntec Usa Guntec Ar15 Castle Nut Wide Extreme Duty is a quality addition to the Guntec USA lineup. For more great deals on AR15 Lower Parts by Guntec USA please browse our GUNTEC USA Gun Parts page. What firearm models does the manufacturer say Guntec USA AR-15 Extreme Duty Wide Castle Nut For Car/M4 Buffer Tube is compatible with? The manufacturer suggests that Guntec USA AR-15 Extreme Duty Wide Castle Nut For Car/M4 Buffer Tube is compatible with AR-15

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$20.66 at MidwayUSA
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