M4 CQB-R Build Part 1

I just about had everything set to assembly this "as is" but my attention to detail got the best of me. I figured while I was here, I would do a step by step of what's on my work bench this week.

The first thing I started with was gearbox cleaning and disassembly. I bought an AIM TOP V2 gearbox almost a year ago and I had it in my KM4 until I found a KWA gearbox that fit better. I disassembled the gearbox and cleaned it using degreaser I bought at the local AutoZone. I had this gearbox overhauled a while back by a local shop and they did an ok job but not quite up to specs. The only changes they made were to replace the wiring harness, and even that broke.

After I got the thing apart, I removed all the gears and springs, the trigger, the selector plate and switch, and the wiring harness. I repaired the broken motor clip and shrink wrapped it. Once the inside was appropriately clean I added a couple drops of TurtleWax finishing compound, smeared it around, and fired up the wire brush on my Dremel to start polishing the interior of the gearbox. Some recommend doing the entire gearbox, which is a good idea, but I just do the areas where the moving parts are.

In the mean time, I used liquid gasket maker and seal the cylinder head inside the cylinder. This should create a complete air seal provided the piston is in good shape, which it does. On the advice of others, I sanded down the front of the tappet plate and super glued the air nozzle to the tappet plate

Now I'm just waiting for the other parts and I'll move on to assembly.