We score a pack a day (5000 pieces) with one gun. It is desirable to observe the rhythm of beats per minute. If you shoot them like a machine gun, it starts to get very hot. In order not to leave marks on the material, disassemble it and lay a gasket in a cup, there you will see a damper rubber, so it presses down over time, and the striker breaks through the material for you. The first pistol bombed about 50 thousand. PC. but does not finish, most likely it is necessary to replace the impact force regulator. The second gun is still holding on, hammering 5000 studs, 25mm per day .