Pro Shot Military Style AR15/M16 Chamber Brush METAL Made in USA Like our Bore Brushes, the Chamber Brush is also made to last with a Brass Core, looped end and bronzed bristles American Standard No.8-32 threads .223/5.56 Diameter Chamber Brushes are Specifically designed for Military Style with a stainless steel skirt to aid in Chamber cleaning All Pro Shot products made in USA from USA components