QMAXX Black Diamond Pump Spray, 8 OZ The 4-in-1 Cleaner, lubricant, metal protectant and rust preventative that keeps Black and repeating action firearms operating at peak performance Specially designed for Black metal surfaces of manganese phosphate to fill metal pores and smooth rough actions NanoMaxx nano-diamond lubrication works like microscopic ball bearings to reduce friction in actions and makes gas plugs and choke tubes easy to remove Dry to touch advanced Cleaning formula removes powder and carbon buildup while lubricating QMAXX silicone-free formula makes actions and bolt reciprocation smoother and load cycling more reliable