The document provides instructions for disassembling and reassembling the low profile 300 Blackout piston system. It describes removing the upper receiver, bolt carrier group, and hand guard to access the piston assembly. The disassembly steps include aligning the piston slot, using a punch to pull back the operating rod, and removing the piston. Reassembly is the reverse of disassembly. The document also provides cleaning and maintenance tips, such as using gun cleaner and wiping off excess lubricant.