Pro-shot's dual purpose design chamber mop can clean and lubricate both the chamber and locking lug recesses of your ar15/m4/m16 platform rifle.The longer smaller part of the mop reaches the chamber area, while the larger diameter is meant to reach the star chamber/ locking lug recess area.Excellent for use after bristled chamber brush for removing excess carbon fouling or excess clp during the cleaning process.This military style model is compatible with.223/5.56mm rifle.Thread Pattern: #8-32Type: Chamber BrushQuantity: 1Bristle Type: WoolMaterial: 100% Cotton MopSuitable For: Rifles