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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