Again, nice work indeed, Grady. Is this your first review? If it is, then next time I suggest you to add power and accuracy test to the review as well. Overall your piece is a good one.
I have a D-boys M4A1 Full Metal as well. It shoots decently, but I have recently switched for a full Guarder hop-up unit to make it a bit more accurate. I got a question to ask you, Graddy: Does the pistons, cylinders and gears from Classic Army, G&P, and Guarder can fit into the gearbox of the D-boys M4A1 Full Metal?
I am asking this question because I am trying to upgrade this gun but is stuck right here. If you can awnser my question, thankyou.