REAL AVID MASTER-FIT® 5/8 MUZZLE DEVICE/A2 BUTTSTOCK EXTENSION TUBE WRENCH

The MASTER-FIT® Armorer’s Crowfoot Wrench series is engineered for the builder who demands shop-level precision and a mar-free finish. When it comes to AR15 assembly, generic, sloppy-fitting wrenches can round off edges or slip under pressure. Each Master-Fit wrench is precision-machined to provide a high-tolerance, no-slip interface with your specific hardware, whether you are clocking a muzzle device, staking a castle nut, or seating a stubborn free-float barrel nut.

PROFESSIONAL PERFORMANCE
Every wrench in this lineup is designed to fit a 1/2-inch drive torque wrench, allowing you to meet exact manufacturer specifications for safety and reliability. Built from high-quality materials, these tools are designed to withstand high-torque demands without flexing or deforming, significantly reducing the risk of "tool walk" or finish damage on your receiver and handguard.

COMPREHENSIVE COMPATIBILITY
The Master-Fit system allows you to select the exact tool required for your specific build. From standard Delta Rings and A2 extension tubes to oversized free-float barrel nuts and specialized 3-prong flash hiders, these individual heads provide a centered load distribution that standard multi-tools cannot match.

FEATURES

• Precision-machined for tight engagement and reduced risk of nut rounding
• Fits all standard 1/2-inch drive torque wrenches
• Supports accurate torque application for critical components
• Minimizes marring and component damage during installation
• Specialized profiles for low-clearance and metric applications
• Dual-purpose AR15 wrench
• Fits 5/8-inch muzzle devices
• Engages A2 extension tubes
• Reduces need for multiple tools

The REAL AVID Master-Fit® 5/8" Muzzle Device / A2 Buttstock Extension Tube Wrench is an essential tool for anyone building, upgrading, or maintaining an AR-15 rifle. Designed to deliver accurate torque, secure fitment, and dependable performance, this specialized wrench head helps ensure proper installation of muzzle devices and fixed-stock components while protecting valuable firearm parts from unnecessary wear or damage.