Is it a CA M249 or clone there of? They are known for the hopup adjustment stripping the piston...
"CNC" simply means "Computer Numerical Control" meaning they where cut or at least partially cut on some sort of computer controlled mill, lathe, or other tool. Often when an airsoft brand says CNC they mean a CNC process was used to finish a cast part which is no better than a cast part to begin with. Unless it says what type of metal it is cut from then its sorta meaningless as to the quality. Also just because its computer controlled doesn't always mean its more accurate, just more repeatable.
Personally if I was going to spend that much money to attend a game I would want the most reliable gun possible, not the craziest.
Do you know how fast 30rps is? I only ask because I'd say 95% of the people I talked to about rate of fire where dead wrong about their own rates of fire. People would claim 25-30rps when they are shooting 15-20rps. The most extreme one was one player who claimed 32rps and swore to me he tested it on two different chronies and got 32rps. I would have guessed his rate of fire at around 14-16rps. Most players would hear a 22rps gun going off and comment on its total insanity. I had people making comments like I must be hitting 60rps with my old highspeed setups when I never broke 32rps. Almost all airsofters have no idea what highspeed setups really sound like. For example this gun is only shooting around 25rps and is still faster than most guns on any given field (skip to 48 seconds):
http://www.youtube.com/watch?v=es8reRJO8...re=related
Apoc had issues with his CA M249 constantly stripping gears so he got the strongest gears he could find. Then his gun striped pistons like mad. His was shooting around 425fps with 25rps. If you get the strongest, most durable gears available your piston will strip. I did highspeed setups for a year or two trying to make it reliable. I was able to get 32rps but if I went higher than 400fps the piston would strip, no matter which one. Even the most durable pistons (of the time), the Prometheus hard type, would strip after 100rnds or so.
The only local expert beyond me I know of on high speed setups was Limit and he quit airsoft years ago and is now into car tuning and has a kid. I have seen him once since he quit but don't know where hes living. Even then his fastest gun ever was only 36rps at 400fps and it went down every other game. They didn't have dual sector gears back then so he would have no experience with them either. When I asked him about going above 400fps with that kind of rate of fire he said its not possible. Even the crazy airsoft tuners he met in Hong Kong when he lived there considered it holy grail level to reach 40rps with 400fps (without double sector gears since they didn't exist; now that's not as difficult but still difficult to make reliable.)
I can tell you right now the 14.1 ratio gears will NOT give even near 500fps with only an Ms130 spring. The double sector gears only half stroke the piston so you are only using the first half of the compression. With how springs work you wont get half fps with half stroking since its not a linear relationship. As I said before Ms170 springs in a half stroke setup would give ~400fps with .20's. You can get up to an Ms210 from Prometheus but I have never heard of any reliable setups using them. Also you can only use a ~325mm inner barrel with a half stroking setup because of cylinder volume reductions.
I have no idea what will give 30+rps with 500fps in an AEG. I have never heard of it being done and I'm not sure its possible to make it last more than a couple hundred rounds. If you do reach that it will cost many hundreds in broken parts for hard earned experience. Even then I can guarantee you it wont be reliable.
My recommended combination for getting near 30rps (maybe 25rps or so) with 500fps springs is:
-Ms130 spring
-Siegetek regular gears (highest speed without going dual sector)
-All metal toothed piston
-SystemA Magnum motor (Turbo might not have the torque, its only rated to Ms120 I believe)
If you want ridiculous rps but with a limit of around 400fps:
-Ms170 spring
-Siegetek dual sector gear set
-SystemA Turbo motor (only half stroking so torque isn't required)
-A quality piston with no less than 8 metal teeth (since they are the only ones engaged)
Also don't forget you will need to rewire the entire gun with minimum 14awg wire. Even 16awg wont have the amperage capacity for max power/speed on the SystemA motors.
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At the end of the day, my personal advice from loosing probably near $1000 tinkering with highspeed setups for a year, is that it is a waste of money and time.
