Tapco AR-15/M4 Stock Wrench - $11.99

This dual-function AR-15/M4 tool is ideal for changing out your old extension tube and installing the newer A4 style tube. Constructed of steel with a rubber handle for a nonslip grip. The cutout fits over A1/A2 receiver extension tubes for removal and replacement. Made in USA. Length: 7-5/8 . Type: Accessories. - $11.99