Description
Anybody who has tried to wrench on an AR15 with mismatched generic tools knows the frustration of a wrench that rounds off a nut or slips at the worst moment. The Real Avid Master-Fit 13-Piece AR15 Crowfoot Wrench Set fixes that by giving you a purpose-built head for pretty much every fastener on the platform. There is one common 1/2-inch drive handle and a lineup of crowfoot heads that swap on and off in seconds, so you go from castle nut to barrel nut to muzzle device without hunting through a junk drawer of adapters.
What You Get in the Master-Fit AR15 Wrench Kit
The heart of this set is the Master-Fit torque wrench, which is adjustable from 10 to 150 foot-pounds with roughly plus or minus 4 percent accuracy. That range covers light castle nut work all the way up to torquing a stubborn barrel nut to spec. The 12 crowfoot heads handle delta ring and free-float barrel nuts, standard and extended castle nuts, a thin castle nut, a 3-prong flash hider, and several free-float nut sizes running from 1-1/8 inch up through 1-5/16 inch, plus 30mm and A2 stock and muzzle device options.
Why the Master-Fit Crowfoot Design Holds Up
Every head is titanium-coated stainless steel, which gives you tight tolerances and a grippy bite on the nut so you are not chewing up finishes or knuckles. The deep-seat fitment means the wrench engages the full nut rather than just catching an edge, and that translates directly into cleaner torque with less risk of slipping. It is the kind of setup that armorers and serious home builders lean on, and it holds up to real bench abuse.
The whole kit rides in a hard-sided case with structured foam pockets and a molded cradle for the torque wrench, so the tools stay put, stay organized, and travel well between the shop and the range. If you build or maintain your own rifles, this is the sort of dedicated tooling that makes the job faster and a lot less aggravating.
Key Specifications
- Manufacturer: Real Avid
- Model: Master-Fit 13-Piece AR15 Crowfoot Wrench Set
- Manufacturer Part Number: AVMF13WS
- UPC: 813119013805
- Pieces: 13 (12 crowfoot heads plus torque wrench)
- Torque Range: 10 to 150 ft-lbs
- Torque Accuracy: +/- 4%
- Drive Size: 1/2 inch
- Crowfoot Material: Titanium-coated stainless steel
- Platform: AR15
- Color: Gray/Red
- Storage: Hard-sided case with structured foam
- Length: 20.2 in
What’s Included
- Master-Fit Torque Wrench (10 to 150 ft-lbs)
- Delta Ring Barrel Nut Wrench
- Free-Float Barrel Nut Wrench
- 3-Prong Flash Hider Wrench
- Extended Castle Nut Wrench
- Standard Castle Nut Wrench
- Thin Castle Nut Wrench
- 5/8 in Muzzle Device / A2 Buttstock Extension Tube Wrench
- 3/4 in Muzzle Device Wrench
- 1-1/8 in Free-Float Barrel Nut Wrench
- 30mm Free-Float Barrel Nut Wrench
- 1-1/4 in Free-Float Barrel Nut Wrench
- 1-5/16 in Free-Float Barrel Nut Wrench
- Hard-sided tool storage case
Frequently Asked Questions
Does the Master-Fit AR15 wrench set include a torque wrench?
Yes. The kit comes with the heavy-duty Master-Fit torque wrench that adjusts from 10 to 150 foot-pounds with about plus or minus 4 percent accuracy. That covers everything from castle nuts to barrel nuts, so you can hit the correct spec on every fastener.
What size drive do the crowfoot heads use?
All 12 crowfoot heads are built on a 1/2-inch drive to match the included torque wrench. You pop off one head and snap on the next, which lets you move between barrel nuts, castle nuts and muzzle devices without swapping tools.
Will this set handle both mil-spec and free-float builds?
It does. There are heads for delta ring and standard A2 components as well as a range of free-float barrel nut sizes from 1-1/8 inch up to 1-5/16 inch, plus a 30mm option. Between the mil-spec and free-float coverage, most common AR15 assemblies are taken care of.
How are the crowfoot wrenches made and do they resist slipping?
Each head is titanium-coated stainless steel with a deep-seat design that engages the full nut rather than just an edge. That tight fit gives you a strong, no-slip bite so you can apply real torque without rounding off or marring your parts.





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