What is the first step in the disassembly of the bolt carrier group?

The first step in the disassembly of the bolt carrier group is the removal of the firing pin retaining pin. This step is essential because the firing pin is held in place by this pin, and without removing it, you cannot safely or effectively proceed with further disassembly. Once the firing pin retaining pin is removed, the firing pin can be taken out, allowing the rest of the components, including the bolt and the gas key, to be disassembled safely.

While detaching the charging handle, taking out the bolt, or removing the gas key are all necessary steps in the overall disassembly process, they cannot begin until the firing pin is free from its retaining pin. Thus, starting with the removal of the firing pin retaining pin ensures that the subsequent steps can be completed without interference.