The Brownells AR-15/M16/M4 buttstock tool is a compact and versatile instrument, specifically engineered to integrate multiple tools into a single unit.

A spanner wrench designed to fit the receiver extension castle nut on M4-style collapsible buttstocks, featuring interchangeable pins to accommodate nuts with both older round and newer square teeth
For fixed rifle buttstocks, a screwdriver blade is used to remove the buttplate screws and a wrench is required for the nut on the receiver extension tube
The tool features a 1/2 inches square opening compatible with a torque wrench, as well as a hole designed for hanging on a pegboard
Conveniently fits into a range bag or pocket for use outside the workshop

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WARNING: Handling firearms or firearms parts can expose you to lead and other petroleum products known to the State of California to cause cancer, birth defects, or other reproductive harm. Wash hands thoroughly after handling. For more information go to www.p65warnings.ca.gov (CA Health and Safety Code Section 25249.6).