Browning Step 4 Gun Oil has met requirements set forth in Mil-L 63460 specs and provides excellent corrosion protection . It is a blend of the finest lubricants available and contains no synthetics. Browning Step 4 has the added benefit of keeping firing residue in suspension which allows for easier cleaning. Browning Step 4 formula is used by international military units and is proven to be a superior lubricant. Meets requirements set forth in Mil-L 63460 specs Excellent corrosion protection Keeps firing residue in suspension for easier cleaning Superior lubricant containing no synthetics