This post has been edited from it's original writing to better show my current progress with the gun.
What: TM MP5A5, Eg700 motor, spring upgraded(Only slightly better than stock spring, can't remember what though). It's about 5 years old with around 3-4 thousand bb's through it. Running an 8.4 1700 battery in it.
I got the gun taken completely apart...didnt lose a single piece(I hope).
Was looking at WGC and just trying to familiarize myself with names of parts. I have a rough idea of what to call everything, instead of "that round thing that goes in the other round thing with gear teeth on it" that is now known as... the piston.
At any rate, everything looks fine. I cant see anything worn down or obviously snapped, which leaves me to wonder what made the mp5 not function in the first place. Wiring? I have no tool to test that...I'll see if there is some back alley crack street fashion of checking.
Onto my mental picture for the gun:
I want it around 390 fps, I'll be putting a much longer barrel on it...i could go with up to 400mm length, hk51(369mm) or m4a1(363mm) or would it be too much a risk to get a G3 barrel and have it cut down to meet my exact length? That would be done by a guy who knows what he's doing when it comes to metal working.
For now, I'll keep looking into the parts...silicone aluminum polycarbonate...high-torque(Assuming for heavier springs?) vs high speed(Guessing lower power spring but high rate of fire?) and should I keep the 700 motor or go ahead and get the 1000 since everything will be under more strain now? Also...bigger voltage battery, got that.
Any links you guys may have or first hand knowledge would be great.