KJW MK1 Carbine under 400 fps?

hey guys, i am trying knock down my kjw mk1 carbine to be at a playable 400 fps (or slightly below). Right now my gun is using stock parts and green gas and I am shooting at 475 fps (with .28 gram pellets). I initially wanted to buy duster gas but I wasn't able to find any on the website I initially bought my gun on. My next step is to buy a chronograph and duster gas and see what my gun shoots at, but I'm sure it will still be above 400 fps. I was curious if anyone here has a kjw mk1 carbine and has been able to get it's fps to adhere to typical airsofting fps limits for a semi auto gun (I am assuming the typical fps limit for a semi is 400 fps, since that's what the rules were last time I went airsofting w/ random players (I haven't been airsofting much)). I really like my gun and I am looking to mod it until I can use it in airsoft games. Last time I went airsofting I was forced to use my pistol because I was over the fps limit. Any info would help me greatly.

I think I read somewhere online about a person who owned the same gun was able to regulate his fps using a "regulator". I haven't been able to figure out what this is, but I am definetly interested.

yeah, there is a regulator, also I havn't been able to find one!

I have also been looking for a silencer for my carbine, just to add a little more interest in it's look. I don't know much about threading or how to mod my carbine to use one, so I have been looking for some sort of silencer kit which will give me all that I need to add a silencer to my gun. I haven't had much luck with that. The only thing that I have found related to a silencer and the kjw mk1 is an adapter, which can be found on this German website

http://hardballshoppen.dk/product_info.php?products_id=10433

That doesn't exactly help me out too much though since I can't read anything.

well, if all else fails ya can use pvc and cardboard

but what do you need?

well, that's the problem, i'm not exactly sure what I need. I will look in to it though, thanks for the help. I am not desperate enough for a silencer to make a cheesy cardboard silencer. If i am going to do it, I am going to spend the money for exactly what I want and do it right.

duster gas will bring it well below 400 fps with .28's.....

that answers one of the questions, the scilencer still remains

http://www.airsoftpost.com/matrix-muzzle-velocity-reducer-adaptor-14mm-positive-clockwise-p-30282.html

I GOT IT

not to be a dick but...you don't got it! XD
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they don't work and are illegal on some fields....like i said use duster gas and 2.8's or 25 and your golden..

they are illegal??

you guys are awesome. I would think that the adapter would probably be illegal on some fields because it would allow the player to chrono the gun prior to the game at a low, playable velocity, and then once on the field the player could crank up the velocity and nobody would know any better since they think he is shooting at a lower fps. It would be an asshole thing to do, but it seems to me that the rule might be for that reason.

easy to do, if you don't mind it being there permantly, do this.
https://www.youtube.com/watch?v=HYvsFJG78f4
but instead of putting a BB there, cut some of the spring off, just a little bit, not even half a loop, and then chrono it, keep going until you hit the lowest you want, you can always put it back up by putting something in there with it.

cool, i didn't even consider doing that. It does make sense though, since you can increase the fps by adding a pellet under the spring, then that means cutting off part of the spring and decreasing the pressure will do the exact opposite, and lower the fps.

Ive done it, used to shoot at a cool 760 fps with .2s, now its RIGHT on 550. And now you can use green gas, there is one side effect though, crazy gas effenciancy