ROCK RIVER ARMS AR-15 M4 STOCK WRENCH
The AR-15 / M4 Stock Wrench is an essential AR-15 armorer's tool designed for the installation, removal, and maintenance of M4-style collapsible stock assemblies and receiver extension components. Built to provide secure engagement with castle nuts and buffer tube hardware, this specialized wrench helps firearm builders, armorers, and gunsmiths perform stock-related tasks with confidence and precision.
Whether assembling a new rifle, replacing a buffer tube, or performing routine maintenance, this durable stock wrench provides the leverage and control needed to properly tighten and remove critical components. Its purpose-built design makes it an indispensable addition to any AR-15 gunsmithing toolkit.
FEATURES
- Designed for AR-15 and M4-style stock systems
- Installs and removes castle nuts
- Supports receiver extension and buffer tube maintenance
- Provides secure engagement with stock hardware
- Durable construction for long-term use
- Delivers improved leverage during installation and removal
- Ideal for AR-15 assembly and maintenance
- Compact design for easy storage
- Suitable for gunsmiths, armorers, and firearm enthusiasts
- Helps ensure proper stock installation
- Rifle receiver extension torque to 35-39 foot pounds
- Carbine receiver extension nut torque to 38-42 foot pounds
SPECIFICATIONS
- Application: Stock Installation and Maintenance
- Compatibility: M4-Style Collapsible Stock Systems
- Use: Assembly, Repair, and Customization
- Construction: Heavy-Duty Steel
- Parkerized finish.
- 7-5/8" (19.3cm) long.
CUSTOMER INSIGHTS
Customers frequently praise the wrench for its simple, effective design and dependable performance when installing or removing castle nuts. Many users appreciate having a dedicated tool for stock work, noting that it provides better engagement and control than improvised solutions. Owners also highlight its durability and value as a must-have addition to an AR-15 maintenance kit.
The AR-15 / M4 Stock Wrench is a practical and reliable tool for maintaining, upgrading, and assembling AR-15 rifles equipped with M4-style collapsible stocks. Offering secure castle nut engagement, durable construction, and easy operation, it provides the functionality needed to perform stock and buffer tube work efficiently and confidently.
See all of our AR15s and AR15 parts here.