Index:In order to distinguish between the two generations of blind rivet guns (old/new), please refer to the pdf (Service -> info blind rivet guns).Old:Machines before production date 9/2022 and without "S" marking on the nose and without gap on the housing sleeve. (Disassembly required)New:Machines after production date 9/2022 and with the "S" marking on the nose and with 1-2 slots on the housing sleeve (Disassembly required)Caution:The use of incorrect parts may lead to malfunctions or defects.