I'm an engineer. I play well with mechanical and electrical gizmos. Never needed an instruction course. Let me play...if I can't figure it out I'll have the manual out and have it completely disassembled and reassembled in no time. Just about everything I have (firearms wise and some vehicles, tools, etc...) I've disassembled and reassembled for the sole purpose of learning how the darn things work. It's just the way I am. No course for simple disassembly and maintenance needed. Now, an armorers course....that's a different story all together.
