NcStar AR-15 Crows Foot Lower Tool Features The NcStar AR-15 Crows Foot Lower Tool is purpose-built to grip and torque the castle nut found on AR-15 and M4 GI spec telescoping stock tube assemblies a task that is difficult to accomplish cleanly with generic tools. Its open-ended crows foot design slips around the stock tube and engages the castle nut s flats directly allowing proper torque to be applied without damaging the finish or the buffer tube threads. Compatibility with both 1/2 and 3/8 drive tools means it works with a wide range of ratchets torque wrenches and breaker bars already in most toolboxes. This flexibility makes it a practical addition for both home builders and professional armorers working through a full build or a simple stock service. Constructed from steel the tool is built to handle the repeated torque loads involved in assembling or servicing AR-15 stocks without deforming or wearing out quickly. At just 6.7 ounces it adds minimal bulk to a tool kit while still delivering the leverage needed to properly seat a castle nut. A matte black finish keeps the tool looking clean through regular shop use and resists corrosion from handling. The NcStar AR-15 Crows Foot Lower Tool is a simple affordable purpose-built solution for anyone regularly working on AR-15 stock assemblies whether in a home workshop or a professional armorer s bench. NC Star AR-15 Crows Foot Lower Tool Specifications Manufacturer: NC Star Model: AR-15 Crows Foot Lower Tool Type: Tool Color: Black Material: Steel Compatible Hosts: AR-15/M4 Castle Nut Weight: 6.7 oz Available At: GrabAGun