The NCStar AR-15 Crow’s Foot Pro Buffer Tube/Castle Tool (brand part no. VTARCFLWRPRO) is built to handle castle nut and buffer tube work on an AR15/M4 lower. Made by NCStar, it combines a castle nut spanner for telescoping stock tubes, an A2 buffer tube wrench, and a flat blade screwdriver for buttstock plate screws into one drive-compatible tool. It’s built for anyone installing or swapping a stock on an AR-pattern lower.

Key Specifications

• A castle nut spanner profile fits GI-spec AR15/M4 castle nuts on telescoping stock tubes.
• It includes an A2 rifle-length buffer tube wrench notch for fixed-stock builds.
• A built-in flat blade screwdriver is sized for A2 buttstock plate screws.
• It’s cut for both 1/2-inch and 3/8-inch drive, so it works with a standard torque wrench or ratchet.

Frequently Asked Questions

Does this tool work on both collapsible and fixed A2 stocks? Yes, it includes a castle nut spanner for telescoping tubes and a separate A2 buffer tube wrench for fixed-stock builds.

Can I torque the castle nut to spec with this tool? Yes, it’s machined for both 1/2-inch and 3/8-inch drive so it mates with a standard torque wrench.

Buy the NCStar Crow’s Foot Pro Castle Nut Tool

For anyone changing out a stock or buffer tube, this crow’s foot tool covers the whole job. Order it from our Lubbock, Texas gun shop for fast, direct shipping, and browse our gunsmithing tools lineup.