Key-Arma Key-701 AR15 Castle Nut

The Key-Arma AR15 Castle Nut is a critical component designed for securing the buffer tube to the lower receiver extension of AR-15 rifles. Engineered for firearm enthusiasts, professional armorers, and tactical users, this castle nut offers reliable retention and stability in both new builds and maintenance of AR15 platforms. Its robust construction ensures consistent performance in demanding field and range environments.

Manufactured by Key-Arma, a trusted name in tactical gear, this AR15 castle nut is precision-machined from high-strength steel to meet or exceed mil-spec standards. The corrosion-resistant finish helps protect against wear and environmental exposure, making it suitable for use in a variety of climates. The castle nut’s standard threading ensures compatibility with most AR-15 and M4-style buffer tubes, providing secure attachment and preventing unwanted loosening during operation. Its design facilitates straightforward installation using standard armorer’s tools, making it a practical choice for both professional gunsmiths and DIY firearm owners.

Specifications

• Manufacturer: Key-Arma
• Model: Key-Arma AR15 Castle Nut
• Category: Rifle Accessories – Spares
• Material: Steel
• Finish: Corrosion-resistant coating
• Thread Pattern: 1 3/16"-16 (mil-spec AR15 buffer tube)
• Compatibility: AR-15, M4, and compatible platforms
• Installation: Requires standard armorer’s wrench
• Weight: Approx. 18 g
• Country of Origin: South Africa