AR15 Barrel Nut Steel, Semi-Monolithic Upper Conversion

ARCA Handguard Steel Barrel Nut for a nearly monolithic conversion upgrade to any upper with our ARCA Handguard or Aero Enhanced Handguard.(This will install as a press fit once torqued)

Enhanced Rigidity – Precise Wedge Fit Capability – American Made

These barrel nuts are specifically engineered to mount our ARCA handguards to a rigid, U.S. made carbon steel barrel nut—eliminating the need for a multitude of shims, while simultaneously wedging the handguard to the upper for an extremely solid lock up. Wedging the interface between your handguard and upper receiver gives a near monolithic feel to the upper assembly. In testing, this design has demonstrated up to a 138% increase in interface rigidity, with a minimum observed improvement of 36%, especially on uppers not inherently designed to prevent handguard shift.

This is a substantial upgrade from standard BAR barrel nuts.

Key Features:

• American-Made Carbon Steel Alloy:
  Built from high-quality U.S. carbon steel. Machined right here in the great state of Texas, for unmatched durability and performance.
• Minimal Shim Requirement:
  Designed to index with zero, one or two shims max, compared to 7–9 with other systems—preserving accuracy and preventing barrel shift (when torqued to 50–55 ft-lbs using a reaction rod through the barrel extension).
• Precision-Machined, Trued Barrel Mating Surfaces:
  Delivers consistent and solid contact, enhancing accuracy potential across multiple barrel swaps. No warping or deformation even with repeated use.
• Steel Construction = No Thread Gauling:
  Eliminates the common issue of aluminum threads distorting under torque. Final production includes lead-in chamfers on the screw holes to prevent misalignment or cross-threading of handguard aluminum as the screw is started. 
• Upgraded Hardware:
  Comes with longer, stronger screws for better clamping force and reduced risk of stripping or head breakage—even after long-term use.
• Improved Wrench Engagement:
  Steel construction resists deformation, reducing the risk of tool slippage during installation compared to aluminum nuts.
• Corrosion Resistant:
  Finished in durable black oxide coating to prevent rust.
• Better Fit & Finish:
  You’ll feel the difference when assembling—tighter tolerances, better alignment, and more solid lock-up.
• Includes:
  New longer screws and shims.

Compatibility:

• Fits mil-spec threaded upper receivers only
• Not compatible with Magpul Armorers Wrench. If replacing an aluminum nut, use the same wrench originally used to install it.
• This upgrade is cross compatible with uppers that currently have or can except existing BAR Barrel barrel nut handguards.