Ergo AR-15 Castle Nut, Steel with Black Finish for Commercial/Military/Hybrid Buffer Tubes 4971B

Product Description

The Ergo 4971B castle nut is a durable steel, black-finished castle nut designed for AR-platform builds. Built to help secure the receiver extension (buffer tube) in place, it is compatible with commercial, military, and hybrid buffer tubes and fits AR-15 rifles and other AR variants.

Product Highlights

• Steel AR-15 castle nut for securing the receiver extension/buffer tube on AR-platform rifles
• Black-coated finish for corrosion resistance and a clean, low-glare look
• Compatible with commercial, military, and hybrid buffer tubes
• Standard Mil-Spec CAR-style castle nut design
• Fits AR-15 and all AR variants (per manufacturer listing)

Specs

• Brand: Ergo
• Manufacturer Part Number: 4971B
• UPC: 810049123000
• Product Type: Castle nut
• Platform Compatibility: AR-15 / AR-platform variants
• Buffer Tube Compatibility: Commercial, Military, Hybrid
• Material: Steel
• Finish/Color: Black

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