Cleaning brush M4 Cal. 30-325/7,62-8 mm Niebling (9-762.20.29). 

• ​Niebling cleaning brush bronze with M4 thread and insertion aid.
• Material: Bronze (softer version), brass.
• Suitable for calibres: .30 - .325 / 7.62 - 8 mm.
• Length: approx. 90 mm.
• Diameter of brush: approx. 8.9 mm.
• Made in Germany.