This wrench also works for your M4 Lock Nut (Castle type).
1/2" drive.
Like all BCM® products, made in USA (410 Stainless Steel).
Exactly what I needed with half inch opening for torque wrench. Fits milspec casto nut perfectly.
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Have to be careful it doesn't slip and damage the nut.I had to buy new nut as well .
Good quality tool.
Wish this item was around ten years ago when I did my first build. Excellent multi use tool. Everyone putting a build together should have one in their tool box.
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