Hello 4X4 forever and jasonjc. To answer your questions the blade that came with the saw was a Milwaukee 14" blade and the instruction sheet that comes in the side box that contains the blade for shipping says "Optimal cutting will produce little or no sparks. Apply more pressure if sparks are present." Like I said, the replacement saw and blade they sent me works incredably well. It cuts very smooth and is extremely precise. I wanted to wait until they sent me the replacement saw before I posted in hopes that the one they sent me the first time was just an oddball defect. Luckily it was and I couldn't be happier with the preformance of the new one.