Real Avid AR15 Brush Combo Kit .223/5.56mm. It contains a star chamber brush and star chamber mop for cleaning inside the hard to reach star chamber. Star Chambers pads help collect left over carbon while applying the perfect amount of oil or solvent. The .223/5.56mm bore brush scrubs baked on carbon from lands and grooves Specifications for Real Avid AR15 Brush Combo: Manufacturer: Real Avid Quantity: 4 Caliber: 5.56x45mm NATO .223 Remington Gun Type: Rifle Gun Model: AR-15 Features of Real Avid AR15 Brush Combo: All components work with standard 8-32 threads Package Contents: Real Avid AR15 Brush Combo What firearm models does the manufacturer say Real Avid AR15 Brush Combo is compatible with? The manufacturer suggests that Real Avid AR15 Brush Combo is compatible with AR-15Real Avid AVAR15BC: AR15 Brush Combo Kit .223/5.56mm