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Questions & Answers
Customer Reviews
Helpful Positive Review
Perfect tool by Crockett Clark, Verified Owner, May 13, 2026
Fits like a glove, Very stout. Well made and nice finish. Super heavy duty tool, will probably outlive the toolbox it is stored in!
1/1 found this helpful
Helpful Positive Review
Real Avid Castle Nut by Fast And Accurate, Verified Owner, February 6, 2026
Was skeptical at first on the quality of this product since this is made in China. I was pleasantly surprised that this in fact is a quality tool. I completed my new build with no issues, Castle nut wrench worked like a charm.
1/1 found this helpful
Most Recent Reviews
Perfect Wrench by Charles Carr, Verified Owner, June 16, 2026
Finish was much better than I could’ve imagined. Less than 1mm play once attached to HK MR556 castle nut.
Most Recent Reviews
Pocket Sized by Mighty by Matt, April 2, 2026
I needed this wrench to tighten down a castle nut. I was in a lurch and needed one ASAP, OpticsPlanet got it to me in a couple of days. I was slightly skeptical that such a short wrench would provide the leverage needed, I was really happy with how e...
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Most Recent Reviews
Real Avid Master Fit Wrench by Prospector, Verified Owner, April 19, 2025
Working Great,Heavy Duty,Must Have Tool. Do your self a favor and grab this one, Others will strip.
Most Recent Reviews
Super tool, must have, So easy to use, Took no time at all, with the tool
Read All 14 Reviews
Color:
Stainless

Code: 6R-CNW-AVMFESCNW-AVMFESCNW

MPN: AVMFESCNW

UPC: 813119013843

List: $50.88Save 25%
$37.99

Product Info for Real Avid Master Fit Extended & Standard Castle Nut Wrench

Master Grade Ar15 Crowfoot Armorer'S Wrench. Master-Fit 1/2 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 Crowfoot Wrench For Buffer Tube Extended And Standard Barrel Nuts.image

The Extended Castle Nut Wrench Is Designed To Work With Buffer End Plates With Sling Attachments And Some Barrel Nuts. The Standard Castle Nut Wrench Is Designed To Work With Your Standard Upper End Plate And Castle Nuts. Designed Specifically For Gun Nuts. Now You Can Say IVe Got A Wrench For That! No More Rigging And Adapting Generic Wrenches To Complete Your Builds. TheMaster-FitExtended & Standard Castle Nut WrenchIs Purpose Built And Specialized For PreciseFitment To Confidently Deliver Torque ToBuffer TubeS Extended And Standard CastleNuts. Titanium Coated Stainless Steel Construction Provides Tight Tolerances For Solid Nut-Gripping Strength And Enhanced No-Slip Tool Control. When Paired With TheMaster-Fit1/2 Drive Torque Wrench, ThisMasterGrade Combo Will Take Your Gun Building Experience To A Whole New Level. TheMaster-Fit1/2 Drive Crowfoot Wrenches Also Work With Any Standard 1/2 Drive Wrench.

WARNING: California`s Proposition 65

Specifications for Real Avid Master Fit Extended & Standard Castle Nut Wrench:

Manufacturer: Real Avid
Color: Stainless
Finish: Titanium
Fabric/Material: Stainless Steel
Gun Model: AR-15
Condition: New

Features of Real Avid Master Fit Extended & Standard Castle Nut Wrench

  • Specialized
  • Precise-Fitment ArmorerS Crowfoot Wrench
  • Fits 1/2 Receiver Torque Wrench Head
  • Purposefully Designed, 2-Sided, To Fit Buffer TubeS Extended And Standard Castle Nuts
  • Titanium Coated Stainless Steel To Confidently Apply Desired Torque While Minimizing Marring On Gun Parts
  • Tight Tolerances For Solid Grip And No-Slip Tool Control

Package Contents:

  • Real Avid Master Fit Extended & Standard Castle Nut Wrench

Real Avid Master Fit Extended & Standard Castle Nut Wrench Orderable Models

List of Orderable Models

  • Real Avid Master Fit Extended and Standard Castle Nut Wrench, AVMFESCNW , MPN: AVMFESCNW , UPC: 813119013843 , Code: 6R-CNW-AVMFESCNW-AVMFESCNW

Real Avid Master Fit Extended & Standard Castle Nut Wrench Unavailable & Discontinued Models

List of Unorderable Models

  • USED Real Avid Master Fit Extended and Standard Castle Nut Wrench, AVMFESCNW, EDEMO3, Used, Condition Like New , MPN: AVMFESCNW-EDEMO3 , Code: 6R-CNW-AVMFESCNW-AVMFESCNW-EDEMO3
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Last updated 2026-07-10 UTC.