Texas Precision Optics Inc

2 Pcs Mil-Spec .223 Castle Nut

2 Pcs Mil-Spec .223 Castle Nut - Main image
$5.75 $8.99 In stock

This listing is for a 2-piece set of Mil-Spec .223 castle nuts from Star Tactical Supply. These are receiver extension castle nuts intended for M4/AR15 type rifles.

  • Product: Mil-Spec .223 Castle Nut
  • Quantity: 2 pieces
  • Brand: Star Tactical Supply
  • Compatibility: M4/AR15 type rifles
  • Use: Receiver extension castle nut

Available in the Standard option under SKU-1a5389516106.

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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.8 / 5 · 5 reviews)

Lucy Z. ★★★★★

Staked the upper on a bench and torqued these down with a standard armorer's wrench, no slipping or galling on the threads. The parkerized finish took the wrench marks without chipping, which is exactly what I wanted for a beater build. Two in the pack means I've got a spare for the next project, so

Ella F. ★★★★★

These fit my buffer tube threads without any wobble, and the staking notches lined up clean both times. Two identical nuts in the pack means I have a spare for the next build.

George ★★★★★

Installed these on two builds and the threading was clean, no binding at all during torque. The finish is a consistent matte black that matches the receiver extension perfectly.