Sun Project M16 Carbine, Escort MP5, and apparently there's more Escort items coming out soon. Check out classicairsoft.net like Mysteryfish noted.

I agree with *ATF*Aurora ...but 1 CO2 cartridge/mag (and sometimes wont even shoot all of the bbs due to the lack of gas (probly only when shooting fullauto)...) might not be a good choice if you are planning to use it as primary weapon...

But i think they released a CO2 to Propane valve or something like that...

WGCShop had didn't have any of these. Would UNC or RedWolf?

check to see if they do

You know... you CAN check their websites yourself? You can also use google, read information resources, etc.
You could do all of those things instead of asking us to look for you and spoonfeed you the answers?

Sun Projects have been out of production for a LONG time now
Escort series gas guns are very expensive as each one is hand-made and hand-tuned before shipping em out
their MP5 I believe are based on a version of the Youth Engineering systems
if you have the cash, you can commission them to make any gun for you, although it is proabably cheaper to purchase 5 or 6 pieces of the real steel equivalent..

I am at work and have been since 8 this morning. I will be here until 8 tonight. Those two websites are blocked by the company for which I work and I simply do not have access to them. WGCShop is, interestingly enough, not blocked. At the time I posted that question, I still had 11 hours left at work.

I understand how you think I'm just being lazy, but please, in the future, be sure you have all the facts before you attempt to reprimand someone.