This is what I have
So now my gun has/has been
Edgi 6.01mm 363mm barrel, teflon taped Systema bucking, Guarder ball bearing spring guide, Guarder SP110, #14 O ring, regreased/reshimmed, and E1 black H nub. I'm getting almost perfect compression and the gun still sounds silky smooth with the new spring. Motor is pulling the spring with no sweat and the ROF is still pretty good, even on a half dead battery. (I estimate about 14 rps) The O ring improved compression quite a bit and it boosted my consistency a ton, so now I have fewer fliers. (and they aren't as dramatic)
All I need is a MOSFET, (I plan to use mostly semi since I'm going for a somewhat DM role) some deans, and maybe some 16wg and I'll be golden. The stock parts really impressed me, other than the spring guide. It is NOT metal like ASGI claims, but I already knew this. The gears seem solid, seem nicer than my E1 gearset. The metal bushings are MUCH nicer than those on my E1. Cylinder/cylinder head gives good compression stock and they are pretty.
After replacing the O ring with a #14, I have almost perfect compression. The piston looks pretty durable and looks identical to this, so hopefully it will last a while. http://www.airsoftgi.com/product_info.php?products_id=3975
Piston head only has 4 ports instead of 6, but I'm getting good compression, so it doesn't matter. I doesn't feel that strong, but is better than the one on my E1. Piston heads rarely break unless you are running a high powered spring. I'm only running an SP110 which is between an M120 and an M130.
Tappet plate seems durable enough and those rarely break. AR latch is one piece and it's an AR latch.......so.....not much to say. Air nozzle is a standard nozzle. I'll probably replace it with a Guarder nozzle because those have an O ring in them.
Overall, I'm really pleased with this rifle. After some upgrades, it is
a really nice weapon. My set up only costs about $310 total (without a battery) and it
should be fairly reliable.
I'm glad I didn't wait for the Gen 3s. It's more fun to upgrade
Here are some pics (taken with my phone, so the quality sucks
Incredibly strong motor grabbing my Guarder spring guide.... ha ha