They are the same gun. Echo1 distributes JG under their name.
.20 gram bbs
maybe a little over 120 feet.
http://www.hitguns.com/ProductDetails.asp?ProductCode=KWA-KM4A1 copy and paste that int the address bar
any mag made by most jg, king arms, echo1, and dboys will fit the gun.
You can buy a dboys or Lancertactical m4A1 for about that much, but they are not very good. they are prone to breaking and don't have great gearboxes. you are better looking at Airsoftgi.com custom's. make sure that the gun you buy is a full metal gun.
Since best is an opinion, I don't know if I can answer your question correctly. In my opinion, the best, most powerful airsoft gun is the M134 by Echo1 airsoft. I shoots 400+ FPS, has 100 rounds per second, and is the biggest freakin monster you'll ever see. Check it out on their homepage- See relted link below answers Sysyema airsoft guns are the best, they are made using high quality reinforced steel. They run anywhere from 400 to 1500 dollars. the second best is the m16 or m4a1 from airsplat the cheapes and best airsoftguns around the max on them babies is 500 plus fps and 200 -250 range but they are in the 1000 price range the ones i have are m16- 400 fps and 190-200 range priced at 169.99 and the m4a1 was 159.99 420 fps and 180-190 fps
tar-21
go with trusted brands like, DBoys, JG, CA, AND TM
Paintball gun. You can see where you hit your target. I disagree, if you are looking for a more realistic looking weopon then use an airsoft gun
As a general rule, you get what you pay for.
Thundermual
of course it is