Ummm as far as I know Echo1 most of their guns like the M4, G3 are JG rebrands and their AK's are CYMA rebrands, the P90 could be a JG/KS/Kart rebrand people have taken apart Echo1's and have found JG and or CYMA parts/serial numbers in them. Speculation is even if they aren't JG's per se, JG and Echo 1 use the same OEM in China. The point is this Echo1 does not do any R&D or really manufacture anything per se, even their high end XCR is OEM'ed by VFC.
And yes JG does make P90's, please see links below:
http://www.airsplat.com/Items/ERM-JG-P90-TR.htm
First Thoughts on my New JG P90 AEG airsoft gun - YouTube
JG P90 TR - YouTube
Also see the below links about Echo 1
http://airsoftpacific.com/viewtopic.php?t=11734
http://www.airsoftforum.com/board/lo...p/t216051.html