The Ergo 4971B Castle Nut Steel Black for AR-Platform is a robust and reliable accessory designed to secure the receiver extension or buffer tube in place. Crafted from durable steel with a sleek black finish, this castle nut is compatible with commercial, military, and hybrid buffer tubes, making it a versatile choice for AR-15 and other AR variants.

This model is ideal for those looking to enhance their firearm's stability and performance. Whether you're at the range or in a competition, the Ergo 4971B ensures your AR-platform rifle is securely outfitted. Known for its precision and durability, Ergo's craftsmanship shines through in this essential firearm accessory.

Key Features:

• Manufacturer: Ergo
• Model: 4971B
• Material: Steel
• Finish/Color: Black
• Platform Compatibility: AR-15 / AR-platform variants
• Buffer Tube Compatibility: Commercial, Military, Hybrid