The ARTL03 is an AR-15 castle nut / stock combo wrench for working on the receiver extension (buffer tube) assembly. It engages the castle nut to lock it against the end plate and seats the stock/buffer-tube hardware during a carbine stock install or removal.

Features:

• Castle-nut spanner with pin notches for tightening and staking the receiver extension lock
• Stock / buffer-tube wrench surface for carbine stock hardware
• Steel construction for repeated armorer use

Use with a standard mil-spec AR-15 carbine receiver extension. Confirm the wrench matches your hardware before applying torque.