Early Spring Cleaning

Way frustrated right now. After the skirmish last weekend, I decided that my KWA M4 needed a tune up. Its beginning to chrono low and my rounds are dropping pretty quick. So last night, I figured I would do a few simple tasks.
1.) Swap out the barrel for a Systema 6.04
2.) Teflon tape the cylinder head and cylinder
3.) Swap the piston head
4.) Swap the spring
Well, the barrel was ready to be install when one of the posts on that hold the adjustment wheels broke. This meant that the wheel that controls the hop up spins freely. This is a no go. I check out KWA’s pro shop and they want $25 for the complete hop-up. Fuck that noise. I’ve decided it would be best to track down the parts at work. I found an SRC two piece hop up and nozzle (because KWA is so proprietary that KWA nozzles only fit in KWA hop ups).
Tonight, I finally was able to sit down and begin installation. Denied. Sure enough, I lack the necessary size allen keys and torx wrenches to even get the gearbox apart. Now I have to find time at work tomorrow to work on my gun. A 30 minute project is turning into a 3 day project.
I run my KWA outdoors for the most part so I want it to be shooting a little faster than normal to support heavier BB’s. What I found, is that KWA uses solid piston heads. because they have such ridiculous compression, when the piston draws back while the round is still in the barrel, it sucks back air that was pushing the bb causing it to destabilize.
I know that KWA installs tightbore barrels to begin with, but I think I am going slightly tighter just to get myself a nicer shot group. I would also be happy with 385-395 for a velocity. Why? Keeps people honest.