Geissele Automatics 05314 Reaction Block Black Steel AR-15/M4/M16

The Geissele Automatics 05314 Reaction Block provides essential barrel stability during precision gunsmithing work on AR-15, M4, and M16 platforms. This professional-grade tool eliminates barrel movement and receiver stress when installing gas blocks, muzzle devices, and performing barrel modifications.

What Makes This Different

Unlike basic barrel vises that can damage finishes or create stress points, the Geissele Reaction Block distributes clamping forces across the barrel extension and chamber area. The precision-machined steel construction provides rigid support without marring barrel surfaces. This tool accommodates standard .223/5.56 chambers and works with both government and heavy profile barrels.

Key Features

• Precision-machined black steel construction for maximum durability
• Compatible with AR-15, M4, and M16 barrel extensions
• Protects barrel finish during installation procedures
• Distributes clamping pressure evenly across chamber area
• Works with government, heavy, and standard barrel profiles
• Professional gunsmith-grade tool tolerances
• Compact design fits standard bench vises

Professional gunsmiths rely on reaction blocks for gas block installations, muzzle brake timing, and barrel nut work. The tool prevents barrel whip and maintains precise alignment during torque applications up to 80 foot-pounds. Whether performing competition rifle builds or duty weapon maintenance, this block ensures consistent results without barrel damage.

Technical Specs

• Material: Heat-treated black steel construction
• Compatibility: AR-15/M4/M16 .223/5.56 chambers
• Barrel Profile Support: Government, heavy, and standard contours
• Vise Requirements: Standard bench vise with 4-inch jaw capacity
• Torque Rating: Supports up to 80 ft-lbs applications
• Finish: Durable black oxide coating
• Manufacturer: Geissele Automatics LLC, USA

This reaction block represents the difference between amateur modifications and professional gunsmithing results. Geissele's reputation for precision manufacturing ensures this tool will handle thousands of installations while protecting valuable barrel investments.