Master Fit Wrench Heads

Master-Fit ½” Crowfoot Wrenches are purpose built and specialized for precise fitment to minimize marring on gun parts. Constructed of titanium coated stainless steel, delivering the highest level of precision to confidently apply torque to AR platform.

Delta Ring Barrel Nut
Crowfoot wrench for mil-spec delta ring barrel nuts.
The Master-Fit Delta-Ring Barrel Nut Wrench is purpose built and specialized for precise fitment to confidently deliver torque to mil-spec delta ring barrel nuts. Titanium coated stainless steel construction provides tight tolerances for solid nut-gripping strength and enhanced no-slip tool control. When paired with the Master-Fit ½” Drive Torque Wrench, this Master Grade combo will take your gun building experience to a whole new level. The Master-Fit ½” Drive Crowfoot Wrenches also work with any standard ½” drive wrench.

Free Float Barrel Nut
Crowfoot wrench for 20-hole and 4-hole free-float barrel nuts.
The Master-Fit Free-Float Barrel Nut Wrench is purpose built and specialized for precise fitment to confidently deliver torque to both 20-hole and 4-hole free-float barrel nuts. Titanium coated stainless steel construction provides tight tolerances for solid nut-gripping strength and enhanced no-slip tool control. When paired with the Master-Fit ½” Drive Torque Wrench, this Master Grade combo will take your gun building experience to a whole new level. The Master-Fit ½” Drive Crowfoot Wrenches also work with any standard ½” drive wrench.

Extended & Standard Castle Nut
Crowfoot wrench for buffer tube extended and standard barrel nuts.
The Extended Castle Nut Wrench is designed to work with buffer end plates with sling attachments and some barrel nuts.
The Master-Fit Extended & Standard Castle Nut Wrench is purpose built and specialized for precise fitment to confidently deliver torque to buffer tube’s extended and standard castle nuts. Titanium coated stainless steel construction provides tight tolerances for solid nut-gripping strength and enhanced no-slip tool control. When paired with the Master-Fit ½” Drive Torque Wrench, this Master Grade combo will take your gun building experience to a whole new level. The Master-Fit ½” Drive Crowfoot Wrenches also work with any standard ½” drive wrench.

Thin Castle Nut
Crowfoot wrench for pistol buffer tube castle nuts.
The Thin Castle Nut Wrench is designed to work with most pistol buffer tubes and pistol braces.
The Master-Fit Thin Castle Nut Wrench is purpose built and specialized for precise fitment to confidently deliver torque to castle nuts on pistol buffer tubes. Titanium coated stainless steel construction provides tight tolerances for solid nut-gripping strength and enhanced no-slip tool control. When paired with the Master-Fit ½” Drive Torque Wrench, this Master Grade combo will take your gun building experience to a whole new level. The Master-Fit ½” Drive Crowfoot Wrenches also work with any standard ½” drive wrench

2" Spanner
Crowfoot 2” spanner wrench for free float barrel nut locking rings.
The Master-Fit 2″ Spanner Wrench is purpose built and specialized for precise fitment to confidently deliver torque to free-float barrel nut locking ring. Titanium coated stainless steel construction provides tight tolerances for solid nut-gripping strength and enhanced no-slip tool control. When paired with the Master-Fit ½” Drive Torque Wrench, this Master Grade combo will take your gun building experience to a whole new level. The Master-Fit ½” Drive Crowfoot Wrenches also work with any standard ½” drive wrench.

3 Prong Flash Hider Wrench
Crowfoot wrench for 3-prong flash hider muzzle devices.
The Master-Fit 3 Prong Flash Hider Wrench is purpose built and specialized for precise fitment to confidently deliver torque to 3-prong flash hiders. Titanium coated stainless steel construction provides tight tolerances for solid nut-gripping strength and enhanced no-slip tool control. When paired with the Master-Fit ½” Drive Torque Wrench, this Master Grade combo will take your gun building experience to a whole new level. The Master-Fit ½” Drive Crowfoot Wrenches also work with any standard ½” drive wrench.

5/8 Muzzle Device/A2 Buttstock Extension Tube
Crowfoot wrench for 5/8” A2 fixed stock receiver extension and 5/8” muzzle devices.
The Master-Fit 5/8” Muzzle Device / A2 Buttstock Extension Tube Wrench is purpose built and specialized for precise fitment to confidently deliver torque to A2 fixed stock receiver extension and 5/8” muzzle devices. Titanium coated stainless steel construction provides tight tolerances for solid nut-gripping strength and enhanced no-slip tool control. When paired with the Master-Fit ½” Drive Torque Wrench, this Master Grade combo will take your gun building experience to a whole new level. The Master-Fit ½” Drive Crowfoot Wrenches also work with any standard ½” drive wrench.

3/4 Muzzle Devices Wrench
¾” Crowfoot wrench for ¾” muzzle devices.
The Master-Fit ¾” Muzzle Device Wrench is purpose built and specialized for precise fitment to confidently deliver torque to ¾” free-float barrel nuts. Titanium coated stainless steel construction provides tight tolerances for solid nut-gripping strength and enhanced no-slip tool control. When paired with the Master-Fit ½” Drive Torque Wrench, this Master Grade combo will take your gun building experience to a whole new level. The Master-Fit ½” Drive Crowfoot Wrenches also work with any standard ½” drive wrench.

1-1/16 Free-Float Barrel Nut
1-1/16” Crowfoot wrench for free-float barrel nuts.
The Master-Fit 1-1/16″ Free-Float Barrel Nut Wrench is purpose built and specialized for precise fitment to confidently deliver torque to 1-1/16” free-float barrel nuts. Titanium coated stainless steel construction provides tight tolerances for solid nut-gripping strength and enhanced no-slip tool control. When paired with the Master-Fit ½” Drive Torque Wrench, this Master Grade combo will take your gun building experience to a whole new level. The Master-Fit ½” Drive Crowfoot Wrenches also work with any standard ½” drive wrench.

1-1/8 Free-Float Barrel Nut
1-1/8” Crowfoot wrench for 1-1/8” free-float barrel nuts.
The Master-Fit 1-1/8” Free-Float Barrel Nut Wrench is purpose built and specialized for precise fitment to confidently deliver torque to 1-1/8” free-float barrel nuts. Titanium coated stainless steel construction provides tight tolerances for solid nut-gripping strength and enhanced no-slip tool control. When paired with the Master-Fit ½” Drive Torque Wrench, this Master Grade combo will take your gun building experience to a whole new level. The Master-Fit ½” Drive Crowfoot Wrenches also work with any standard ½” drive wrench.

30mm Free-Float Barrel Nut
30mm Crowfoot wrench for 30mm free-float barrel nuts.
The Master-Fit 30mm Free-Float Barrel Nut Wrench is purpose built and specialized for precise fitment to confidently deliver torque to 30mm free-float barrel nuts. Titanium coated stainless steel construction provides tight tolerances for solid nut-gripping strength and enhanced no-slip tool control. When paired with the Master-Fit ½” Drive Torque Wrench, this Master Grade combo will take your gun building experience to a whole new level. The Master-Fit ½” Drive Crowfoot Wrenches also work with any standard ½” drive wrench.

1-1/4 Free-Float Barrel Nut
1-1/4” Crowfoot wrench for 1-1/4” free-float barrel nuts.
The Master-Fit 1-1/4” Free-Float Barrel Nut Wrench is purpose built and specialized for precise fitment to confidently deliver torque to 1-1/4” free-float barrel nuts. Titanium coated stainless steel construction provides tight tolerances for solid nut-gripping strength and enhanced no-slip tool control. When paired with the Master-Fit ½” Drive Torque Wrench, this Master Grade combo will take your gun building experience to a whole new level. The Master-Fit ½” Drive Crowfoot Wrenches also work with any standard ½” drive wrench.

1-5/16 Free-Float Barrel Nut
1-5/16” Crowfoot wrench for 1-5/16” free-float barrel nuts.
The Master-Fit 1-5/16” Free-Float Barrel Nut Wrench is purpose built and specialized for precise fitment to confidently deliver torque to 1-5/16” free-float barrel nuts. Titanium coated stainless steel construction provides tight tolerances for solid nut-gripping strength and enhanced no-slip tool control. When paired with the Master-Fit ½” Drive Torque Wrench, this Master Grade combo will take your gun building experience to a whole new level. The Master-Fit ½” Drive Crowfoot Wrenches also work with any standard ½” drive wrench.