Secure your build with unmatched strength and reliability. The AR15 / M16 / AR10 Steel Castle Nut is engineered to deliver rock-solid performance in even the most demanding shooting conditions. Whether you’re assembling a new rifle or replacing parts, this Mil-Spec component ensures the durability, precision, and dependability serious shooters demand.
✅ Universal Compatibility Across Platforms
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Designed for AR15, M16, and AR10 platforms
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Seamless fit with all standard carbine buffer tubes
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Versatile use across multiple rifle configurations
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A trusted solution for gunsmiths and DIY builders alike
✅ Notched for Staking – Maximum Lock-Up Security
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Precisely machined staking notches
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Rock-solid lock-up under heavy use
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Prevents movement or loosening during high round counts
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Added confidence in accuracy and consistent recoil control
✅ Premium Phosphate Coating
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Provides long-lasting corrosion resistance
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Clean, professional matte appearance
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Added surface hardness for rugged field conditions
✅ Lightweight, High-Strength Construction
✅ Mil-Spec Precision Fit
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Manufactured to strict Mil-Spec standards
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Ensures reliable compatibility with other Mil-Spec parts
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Delivers consistent and accurate fit every time
✅ 100% Made in the USA
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Proudly crafted in America
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Built to the highest standards of quality
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Backed by a trusted reputation
Key Features at a Glance:
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Fits AR15, M16, AR10 platforms
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Mil-Spec steel construction for precision fit
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Durable phosphate coating for corrosion resistance
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Staking notches for secure lock-up
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Lightweight at just 0.6 oz
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Made in the USA with pride
Lock down your build with the Steel Castle Nut — a small but critical component engineered to deliver uncompromising strength and reliability in every shot.
